CONTRIBUTIONS FROM THE MUSEUM OF PALEONTOLOGY UNIVERSITY OF MICHIGAN VOL M, NO.10, pp. 271-366 (19 pk) MARCH29,1950 PRE-TRAVERSE DEVONIAN PELECYPODS OF MICHIGAN UNlWZWITY OF MICHIGAN PRESS ANN ARBOR CONTRIBUTIONS FROM THE MUSEUM OF PALEONTOLOGY J UNIVERSITY OF MICHIGAN Erector: LEWISB. ULLUM The series of contributions from the Museum of Paleontology is a medium for the publication of papers based entirely or principally upon the collections in the Museum. When the number of pages issued is sufficient to make a volume, a title page and a table of contents will be sent to libraries on the mailing list, and also to individuals upon request. Correspondence should be directed to the University of Michigan Press. A list of the separate papers in Volumes II-VI will be sent upon request. VOL. I. The Stratigraphy and Fauna of the Hackberry Stage of the Upper Devonian, by C. L. Fenton and M. A. Fenton. Pages xii-260. Cloth. $2.75. VOL. 11. Fourteen papers. Pages ix+24b. Cloth. $3.00. Parts sold separately in paper covers. VOL.111. Thirteen papers. Pages vG+275. Cloth. $3.50. Parts sold separately in paper covers. VOL.IV. Eighteen papers. Pages viiif 295. Cloth. $3.50. Parts sold separately in paper covers. VOL. V. Twelve papers. Pages viiif 318. Cloth. $3.50. Parts sold separately in paper covers. VOL.VI. Ten papers. Pages viiif 336. Paper covers. $3.00. Parts sold separately. (Continued on inside back cover) VOL. VII . NO. 10. PJ). 271-388 (19 pk) MARCH29.1950 PRE-TRAVERSE DEVONIAN PELECYPODS OF MICHIGAN BY AUR~LELA ROCQUE CONTENTS Introduction .......................................................... 273 General statement ................................................. 273 Previous work .................................................... 273 Classification..................................................... 275 Material ......................................................... 275 Acknowledgments................................................. 275 Systematic descriptions ................................................ 276 Family Pterineidae ................................................ 276 Genus Pterhea Goldfuss ....................................... 276 Genus Cornellites Williams ...................................... 276 Genus Follmannella Williams ................................... 278 Genus Actinopterella Williams ................................... 280 Family Leiopteriidae ............................................... 282 Genus Leiopteria Hall .......................................... 282 Genus' Actinodesma Sandberger and Sandberger ................... 284 Family Kochiidae ................................................. 285 Genus Leptodesma Hall ......................................... 285 Diodontopteria, gen . nov ........................................ 288 Family Aviculidae ................................................. 291 Genus Limoptera Hall .......................................... 291 FamilyAmbonychiidae ............................................ 293 Genus Gosseletia Barrois ........................................ 293 Family Mytilidae ................................................. 294 Liromytilus, gen . nov ........................................... 294 Family Modiolopsidae............................................. 298 Genus Modwmwpha Hall ....................................... 298 Genus Goltiophma Phillips ....................................... 298 Family Nuculidae ................................................. 300 Genus Nuculoidea Williams and Breger ........................... 300 Family Ledidae ................................................... 301 Genus Pdaeuneilo Hall ......................................... 301 271 A UBLE LA ROCQUE Family Trigoniidae................................................ 302 Genus Schizodus King .......................................... 302 Family Pleurophoridae............................................. 303 Genus Cypricardinia Hall ...................................... 303 Family Lucinidae ................................................. 304 Genus Ilionia Billings .......................................... 305 Genus Paracyclas Hall .......................................... 307 Phenacocyclas, gen . nov ......................................... 312 Family Conocardiidae .............................................. 317 Genus Conocardium Bronn ...................................... 317 Family Praecardiidae.............................................. 323 Genus Panenka Barrande ...................................... 323 Family Solenopsidae.............................................. 327 Genus Solenommpha Cockerell .................................. 327 Stratigraphic distribution and correlations ................................ 328 General statement ................................................ 328 Garden Island formation .......................................... 330 Bois Blanc formation .............................................. 330 Sylvania sandstone ............................................... 331 Flat Rock dolomite ............................................... 332 Anderdon limestone .............................................. 333 Amherstburg dolomite ............................................ 335 Lucas dolomite .................................................. 336 Dundee limestone ................................................ 337 Rogers City limestone ............................................ 338 List of localities ...................................................... 340 Literature cited ...................................................... 344 Plates ........................................................ .(after) 348 PRE-TRAVERSE DEVONIAN PELECYPODS 273 INTRODUCTION GENERAL STATEMENT HIS study deals with the pelecypod fauna of the pre-Traverse TDevonian rocks of Michigan. The pelecypods of the Traverse formation are excluded as they have been the subject of a special study by Tsun-Yi Yang (unpublished thesis, Yale University). The classiiication and succession of the rocks from which the pelecypods were collected are shown in Table I (page 329). Pelecypods are not a conspicuous element of the Devonian faunas of Michigan. Assemblages of pelecypods are rare; the number of species or individuals is small in any given formation. The few species present in Michigan contrast greatly with the abundance of forms from the Devonian strata of New York. In Michigan, pelecypods are common only in some strata of the Detroit River group of the south- eastern part of the state, in a dolomitic limestone of the basal part of the Rogers City limestone, and in a few beds of the Traverse group of the northern part of the Lower Peninsula. PREVIOUS WORK No previous paper has been devoted exclusively to the Devonian pelecypods of Michigan. Most of the species in the state had already been described from other areas; few new species have been recorded from Michigan. Because of this lack of comprehensive treatment, it seems advisable to give here a brief review of the literature on the pelecypods of the Devonian rocks below the Traverse group. Rominger (1876, p. 26) mentioned Lucina elliptica and Conocardium trigonale from the quarries of Trenton Village, Wayne County; Cmo- cardium trigonale from the sand rock (? Sylvania) of the Bond farm, Raisinville Township, Monroe County (p. 27); Megambmtia avicu- loidea and "several other bivalves" from Plum Creek quarries, Monroe County (p. 34) ; Luci~taelliptica from False Presque Isle, Presque Isle County (p. 51); Lzccina elliptica, Myalina carinutu, Avicula Jabella, and "casts of other large bivalves" from Middle Island (p. 51); and Lucina elliptica and Lucina, sp. nov. from Crawford's quarry (p. 52). 274 AU-LE LA ROCQUE Sherzer and Grabau (1909) listed Conocardium monroense Sherzer and Grabau from the Anderdon bed of the salt shaft and the Anderdon quarry (p. 547); Panenka canadensis Whiteaves, Cypicardinia cana- dense Grabau, and ConocardizGm monroense Sherzer and Grabau from the Amherstburg bed (p. 548); and Panenka canadensis Whiteaves, Pterinea bradti Sherzer and Grabau, Goniophora sp., and Conocardium monroense Sherzer and Grabau from the Lucas dolomite (p. 550). Grabau (1910) in his detailed work on the Monroe formation re- corded several species of pelecypods. The Devonian species included are Panenka canadensis Whiteaves (pp. 163-64), Pterinea lanii Sherzer and Grabau (pp. 164-66), Pterinea bradti Sherzer and Grabau (pp. 166-68), Goniophora? sp. (pp. 169-70), Cypricardinia canadensis Grabau (p. 170), and Conocardium monroicum Grabau (pp. 171-73), an emendation of C. monroense Sherzer and Grabau (1909). Grabau (1913, pp. 349-53) listed the following species from the Dundee limestone of Michigan: Sanguinolites sanduskyensis Meek, Actinodesma erectum Conrad, Conocardium trigonale Hall, Actinopteria decussata Hall, Awiculopecten similis (Whitiield), Awiculopecten sp., and Paracyclas elliptica Hall. Pohl's (1929~~19296) study of the Middle Devonian pelecypods of Wisconsin yielded important information on the Middle Devonian of Michigan. His systematic descriptions include a number of observa- tions on Michigan species, all of which have been noted under the appropriate headings in the systematic part of this paper. Bassett (1935) in his careful stratigraphic study of the Dundee limestone recorded several pelecypods. In his section of the Sibley quarry (pp. 429-31) he cited Paracyclas elliptica Hall from Unit 25, Actinodesma occidentale (Hall) from Unit 23, and (p. 430) "several