SMITHSONIAN MISCELLANEOUS COLLECTIONS VOLUME 67, NUMBER 9 CAMBRIAN GEOLOGY AND PALEONTOLOGY IV No. 9.—CAMBRIAN AND OZARKIAN BRACHIOPODA. OZARKIAN CEPHALOPODA AND NOTOSTRACA (With Plates 106 to 126) BY CHARLES D. WALCOTT (Publication 2753) CITY OF WASHINGTON PUBLISHED BY THE SMITHSONIAN INSTITUTION JUNE 3, 1924 Zfyt JSoro (gaitimaxt (preee BALTIMORE, MD., U. S. 1 CAMBRIAN GEOLOGY AND PALEONTOLOGY IV No. 9.—CAMBRIAN AND OZARKIAN BRACHIOPODA, OZARKIAN CEPHALOPODA AND NOTOSTRACA By CHARLES D. WALCOTT (With Plates 106-126) CONTENTS Introduction 479 Brachiopoda 481 Description of species 481 Genus Micromitra Meek 481 Micromitra zenobia Walcott, Middle Cambrian 481 Micromitra (Iphidella) pannula (White), Middle Cambrian 482 Genus Obolus Eichwald 482 Obolus ion, n. sp., Ozarkian (Mons) 482 Obolus leda Walcott, Ozarkian (Notch Peak) 483 Obolus myron, n. sp., Upper Cambrian 484 Obolus perone, n. sp., Upper Cambrian 484 Obolus tetonensis Walcott, Ozarkian (Chushina) 484 Obolus cf. tetonensis Walcott, Ozarkian (Mons) 485 Obolus teuta, n. sp., Ozarkian (Mons) 486 Obolus whymperi, n. sp., Lower Cambrian 487 Obolus (Westonia) ollius, n. sp., Upper Cambrian 487 Obolus (Westonia) tertia, n. sp. Ordovician (Sarbach) 487 Obolus (Fordinia) nestor, n. sp., Upper Cambrian 488 Genus Lingulepis Hall 488 Lingulepis nabis, n. sp., Ozarkian (Mons) 489 Genus Lingulella Salter 490 1 Lingulella cf. desiderata Walcott, Ozarkian (C. and M.) 490 Lingulella ibicus, n. sp., Ozarkian (C. and M.) 49* Lingulella miltoni, n. sp., Ozarkian 492 Lingulella nechos, n. sp., Ordovician (Sarbach) 492 Lingulella nepos, n. sp., Ozarkian (Mons) 493 Lingulella nerva, n. sp., Ozarkian (Mons) 493 Lingulella ninus, n. sp.. Ozarkian (Chushina) 494 Lingulella remus, n. sp., Ozarkian (C. and M.) 494 Lingulella siliqua, n. sp., Upper Cambrian 495 Lingulella cf. similis Walcott, Ozarkian (Mons) 495 Lingulella waptaensis, n. sp., Middle Cambrian 496 1 C. and M. = Chushina and Mons formations. Smithsonian Miscellaneous Collections, Vol. 67, No. 9 477 478 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 6j PAGE Genus Acrotreta Kutorga 49° Acrotreta atticus, n. sp., Ozarkian (Chushina) 496 Acrotreta discoidea, n. sp., Ozarkian (Chushina) ^97 Acrotreta cf. microscopica Shumard, Ozarkian (Mons) 497 Genus Acrothyra Matthew 498 Acrothyra gregaria, n. sp., Middle Cambrian 498 Genus Nisusia Walcott 498 Nisusia spinigera, n. sp., Upper Cambrian 498 Nisusia burgessensis, n. sp., Middle Cambrian 499 Nisusia (Jamesella) oriens, n. sp., Lower Cambrian 500 Genus Wimanella Walcott 500 Wimanella borealis, n. sp., Middle Cambrian 501 Wimanella occidens, n. sp., Upper Cambrian 5 01 Genus Billingsella Hall and Clarke 501 Billingsella archias, n. sp., Ozarkian (C. and M.) 501 Billingsella olen, n. sp., Ozarkian (Mons) 5 02 Billingsella origen, n. sp., Ozarkian (Mons) 503 Genus Protorthis Hall and Clarke 503 Protorthis iones, n. sp., Ordovician (Sarbach), Ozarkian (Mons) . 503 Protorthis porcias, n. sp., Ordovician (Sarbach), Ozarkian (Mons) 504 Genus Eoorthis Walcott 505 Eoorthis bellicostata, n. sp., Middle Cambrian 505 Eoorthis desmopleura (Meek), Ozarkian 506 Eoorthis fascigera, n. sp., Upper Cambrian 507 Eoorthis iophon, n. sp., Ozarkian (Mons) 508 Eoorthis lineocosta, n. sp., Ozarkian (Manitou) 508 Eoorthis ochus, n. sp., Ozarkian (Mons) 509 Eoorthis putillus, n. sp., Ozarkian (C. and M.) 509 Eoorthis putillus laeviuscula, n. var., Ozarkian (Mons) 511 Eoorthis vicina, n. sp., Ozarkian (Mons) 512 Eoorthis wichitaensis Walcott, Upper Cambrian, Ozarkian (Mons) 513 Genus Finkelnburgia Walcott 514 Finkelnburgia noblei, n. sp., Upper Cambrian 514 Family Syntrophidae 515 Genus Syntrophia Hall and Clarke 515 Syntrophia cf. calcifera Billings, Ozarkian (Mons) 516 Syntrophia isis, n. sp., Ozarkian (Mons) 517 Syntrophia nisis, n. sp., Ozarkian (Mons) 517 Syntrophia nonus, n. sp., Ozarkian (Mons) 518 Syntrophia perilla, n. sp., Ozarkian (Mons) 519 Genus Huenella Walcott 520 Huenella hera, n. sp., Upper Cambrian 520 Huenella icetas, n. sp., Ozarkian (Mons) 520 Huenella juba, n. sp., Ozarkian (Mons) 521 Huenella simon, n. sp., Upper Cambrian 521 Huenella texana Walcott. Upper Cambrian 522 Huenella ? weedi, n. sp., Upper Cambrian 522 NO. 9 CAMBRIAN AND OZARKIAN BRACHIOPODA 479 PAGE Brachiopods from Island of Novaya Zemlya, Russia 523 Obolus (Westonia) sp. undt 523 Lingulella cf. desiderata Walcott. 524 Lingulella arctica Walcott 524 Acrotreta sp. undt 525 Billingsella holtedahli Walcott 525 Billingsella ? oppius Walcott 525 Eoorthis sabus Walcott 526 Huenella triplicata Walcott 526 Cephalopoda 527 Genus Ellesmeroceras Foerste 527 Ellesmeroceras robsonensis, n. sp., Ozarkian (C. and M.) 027 Endoceras ( ?) monsensis, n. sp., Ozarkian (C. and M.) 529 Order Notostraca Sars 530 Family Technophoridae Miller 530 Genus Ozomia, n. genus 531 Ozomia lucan, n. sp., Ozarkian (Mons and St. Charles) 531 ILLUSTRATIONS FACING PAGE Plates 106-125. Brachiopoda 534~553 Plate 126. Cephalopoda, Notostraca 554 INTRODUCTION The field reconnaissance of the pre-Devonian formations of Alberta and British Columbia, Canada, that I have been conducting the past six seasons has resulted in the accumulation of collections that have received preliminary study and are now being prepared for illustra- tion and description. The first paper resulting from this field-work was issued in March, 1923, on the " Nomenclature of Some post-Cambrian and pre-Cam- 1 brian Formations." In this, preliminary lists of fossils are given and among them three brachiopods that are described in this paper, Lingulella ibicus Walcott, Eoorthis tones Walcott, Syntrophia isis Walcott. E. iones is now referred to Protorthis. In addition to the above there are 50 new species and one variety listed in the table of contents. These include not only those from the Cordilleran area of Canada, but a few from various localities in the United States that have been found in older collections from various sources now in the U. S. National Museum. 1 Smithsonian Misc. Coll., Vol. 67, No. 8. : 480 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 6j The species are distributed as follows Ordovician 6 Ozarkian 26 Cambrian 20 52 Common to Ozarkian and Ordovician 2 Total new species 50 One new variety. Brachiopods are relatively rare in genera and species in the forma- tions in which I have been working in Alberta and British Columbia. This in a measure is owing to their destruction by wave and current action, and also to the fact that conditions accompanying the great calcareous deposits do not appear to have afforded them a favorable habitat. An occasional quiet bay or inlet provided food and shelter from the strong tides and currents, and in these, colonies of a few species flourished in great numbers. The species described by me since the preparation of Monograph 51, published in 1912 are Obolus mollisonensis Walcott 2 Lingulella moosensis Walcott 2 2 Lingulella ? allani Walcott Mickwitzia muralensis Walcott 3 Lingulella chapa Walcott 3 Lingulella hitka Walcott 3 Obolella nuda Walcott * Micromitra (Paterina) charon Walcott 4 Obolus damo Walcott 4 * Acrothele clitus Walcott Wimanella catulus Walcott 4 The present paper also includes the only two cephalopods, and one Notostracan thus far discovered in the Mons formation. The study of the gasteropoda of the Sarceen ° formations is well advanced, also the description and illustration of new genera of trilobites. It is planned to include these papers in Volume 75 of Smithsonian Mis- cellaneous Collections. Through the courtesy of Dr. Olaf Holtedahl, I have had the oppor- tunity of studying a small collection of brachiopods from Novaya 1 Mong. U. S. Geol. Surv., No. 51, 1912. 2 Smithsonian Misc. Coll., Vol. 57, No. 7, 1912, pp. 231, 232. 3 Idem, No. 11, 1913, pp. 310-312. 4 Smithsonian Misc. Coll., Vol. 67, No. 3, pp. 69-70. 5 Smithsonian Misc. Coll., Vol. 67, No. 8, 1923, p. 471. NO. 9 CAMBRIAN AND OZARKIAN BRACHIOPODA 481 1 Zemlya, Russia, which he discovered there. The brachiopods are described and illustrated in this paper and they will also be published later in Norway with the associated trilobites. The fauna is essen- tially of a lower Ozarkian Mons facies and belongs, as Dr. Holtedahl states, with the Pacific Province and not the Atlantic. The genera and species of brachiopods include LingulcUa cf. desiderata Walcott, L. arctica n. sp., Acrotreta sp. undt., Obolus {Westonia) sp. undt., BiUingsella holtedahli n. sp., B. ? oppius n. sp., Eoorthis sabus n. sp., Huenella triplicata n. sp. The photographs of brachiopods illustrated in this paper were made by Dr. Charles E. Resser, of the U. S. National Museum, and the retouching of photographs was done by Miss Francis Wieser. BRACHIOPODA DESCRIPTION OF SPECIES Genus MICROMITRA Meek See Mong. U. S. Geol. Surv., No. 51, 1912, p. 332, for synonymy, description and illustration. MICROMITRA ZENOBIA Walcott Plate 106, figs. 1-7 Micromitra zenobxa Walcott, 1912, Mong. U. S. Geol. Surv., No. 51, p. 342, text fig. 23. Describes and illustrates species with one text figure. The type of this species occurs in the Burgess shale of the Stephen formation, and the specimens illustrated in this paper occur in a calcareous shale about 1,000 feet (304.8 m.) distant from the type locality and a little above the horizon at the type locality. All the shells are flattened and more or less distorted; none of them exhibit the interior surface and only traces of the pseudo cardinal area are preserved; they afford, however, fine illustrations of distortion with considerable fracturing of the test of the shell, and are worth