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Brichydra and Mlcsura-OF PORTO RICO

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Brichydra and Mlcsura-OF PORTO RICO 459 / <<*s » J—** L /'.,»»>-»^ - VWAW.fe'f;v;vaS-W*fiMM!.SSI0N °F FISH AND FISHERIES, -' U'^>»1 GEORGE M, BOWERS, Commissioner. THE BRiCHYDRA AND MlCSURA-OF PORTO RICO. BY MARY J. RATHBUN, Assistant Curator of Marine Invertebrates, /'. S. National Museum. Extracted from U. S. Fish Commission Bulletin, for 1900, Volume 2. Pages 1 to 127 and 129* to 137*. Plates 1 and 2, * WASHINGTON: GOVERNMENT PRINTING OFFICE. 1 9 01. tii^VL U. S. COMMISSION OF FISH AND FISHERIES, GEORGE M. BOWERS, Commissioner. THE BRACHTURA AND MACRURA OF PORTO RICO, BY MARY J. RATHBUN, Assistant Curator of Marine Invertebrates, U. S. National Museum. Extracted from U. S. Fish Commission Bulletin for 1900, Volume 2. Pages 1 to 127 and 129* to 137*. Plates 1 and 2. WASHINGTON: GOVERNMENT PRINTING OFFICE. 1901. THE BRACHYURA AND MACRDRA OF PORTO RICO. BY MARY J. RATHBUN, Assidant Curator of Murine Invertebrates, U. S. National Museum. 1 i BULL.U.S. F.C. 1900. M.J. RATH BUN PLATE UCiDES CORDATUS, FEMALE, NATURAL SIZE GONIOPSIS CRUENTATA,MALE,NATURALSIZE ULIUS BIEN 8 CO LITH t A.H.B.pinx. THE BRACHYURA AND MACRURA OF PORTO RICO. By MARY J. RATHBUN, Assistant Curator of Marine Invertebrates, U. S. National Museum. The creatures described in the following paper belong to the well-known class of crustaceans, and to that division in which the eyes are mounted on stalks, usually movable, and the walking feet are ten in number. The terms Brachyura and Macrura are here used in a limited sense, as denned by Dana, Stimpson, and Bate. In the Brachyura, or true crabs, the carapace or main part of the shell is usually wide and more or less flattened; the front part often projects to form a beak or rostrum; the antennae are inconspicuous; the abdomen is small, bilaterally symmetrical, and folded under the carapace; of the five pairs of thoracic legs, the first pair are furnished with claws and are commonly larger than the remaining ones, which are similar. The Macrura, or shrimps and lobsters, are elongated—that is, the carapace is longer than wide, and either subcylindrical or compressed; the rostrum is usually present, and often prominent; the antennae are well developed; the abdomen or tail is longer than the carapace and is extensile; way or none of the relatively slender thoracic legs may be chelate. Crabs and shrimps may be found along the seashore on the sandy and muddy bottoms, under stones, in crevices of rocks, corals, and sponges, in shells of living ' bivalve mollusks, in tubes of annelids, and on the tests of sea-urchins. They may be taken with the dredge and tangle from all depths of the sea; some species swim at the surface, others frequent brackish water at the mouths of rivers. Fluviatile crabs and shrimps occur in rivers and streams and along their banks, occasionally in ditches or among roots of trees, while the true land crabs may inhabit localities remote from salt or fresh water. The only systematic list of Porto Bican decapodous crustaceans is that made by John Gundlach in his "Apuntes para la Fauna Puerto-Riquena, vi, Crustaceos." * Fifty-two species are there enumerated, of which 37 are Brachyura and 8 are Macrura. The following list contains 162 Brachyura and 59 Macrura. These species were, with few exceptions, taken by the naturalists of the Fish Hawk in 1899. An.examination has been made, also, of specimens collected by Dr. L. Stejneger, Dr. C. W. Richmond, and Mr. Paul Beckwith, of the U. S. National Museum; Mr. A. B. Baker, of the 1 Anales Soc. Espan. Hist. Nat., xvi, 115-133, 1887. 3 4 BULLETIN OF THE UNITED STATES FISH COMMISSION. National Zoological Park; Mr. G. M. Gray, of Woods Hole, Mass., and Mr. L. M. McCormiok, of the Glen Island Museum. The crustaceans dredged by the Fish Hawk represent the fauna of the coast to a depth of 225 fathoms, although the majority of the species come from within the 100-fathom line. Our list also includes the fauna of the fresh waters and land crabs. One genus and 14 species of Brachyura and 1 genus and 13 species of Macrura are described as new. The types are in the U. S. National Museum. The definitions of families and genera have been in large part quoted or con: densed from other authors. The division into families is mainly that of Stebbing.1 In connection with the work on Porto Rican species, a large number of specimens of the same species in the West Indian collection of the National Museum have been determined, and the localities noted.2 List of dredging stations of the U. >S. Fish Commission steamer Fish Hawk about the island, of Porto Rico at which Brachyura and Macrura -were collected. Station Depth. Dredging No. instruments*. 1899. Fathoms. 6051 Jan. 13 Off entrance to San Juan 45 Tangle. Harbor. 6064 Jan. 16 San Juan Harbor 4i to 5J .do. Dredge and tangle. 6055 Jan. 18 Off Aguadilla 137 Sand, mud, and shells. Dredge. 6057 Jan. 19 Mayaguez Harbor 4i Sticky mud Do. 6058 Jan. 19 do 7* do 7-foot beam trawl. 6059 Jan. 19 .do. 7 do Do. 6060 Jan. 19 .do. 12 do Dredge. 6061 Jan. 20 .do. 12 to 18 Sand, mud 11-foot beam trawl. 6062 Jan. 20 .do. 25 to 30 Sand, mud, and shells. Dredge. 6063 Jan. 20 .do. 75 to 76 Rocky, sand, and coral 11-footbeam trawl. 6064 Jan. 20 .do. 22 to 33 Sand,' mud Dredge. 6065 Jan. 20 .do. 4 to 6 Coral Do. 6066 Jan. 20 .do. 161 to 172 Sand, mud 11-footbeam trawl. 6067 Jan. 20 .do. 97 to 120 Coral Dredge. 6070 Jan. 21 .do. 220 to 225 Rocky 9-foot beam trawl. 6072 Jan. 25 Oil" Punta de Melones. 7i Coral, sand, shells Tangle. 6073 Jan. 25 do (?) Dredge. 6074 Jan. 25 Off Puerto Real Coral, sand Tangle. 6075 Jan. 25 Off Boca Prieta do Do. 6076 Jan. 26 OffGallardoBank.... 10 do... Do. 6079 Feb. 6 Off St. Thomas 20 to 23 Coral Do. 6080 Feb. 6 do 20 do Dredge. 6084 Feb. 8 Off Vieques Island 11 Coral, sand, shells Tangle. 6085 Feb. 8 do 14 Coral, sand 7-foot beam trawl. 6086 Feb. 8 Off Culebra Island.... 14| do Dredge. 6087 Feb. 8 do 15* do Tangle. 6089 Feb. 8 Off Vieques Island 21 Coral Do. 6090 Feb. 8 Off Culebra Island.... 16 .do Do. 6091 Feb. 8 Off Vieques Island 15 .do. Do. 6092 Feb. 8 do 16 .do. Do. 6093 Feb. 8 Off Culebra Island.... 15 .do. Do. 6094 Feb. 8 Off Vieques Island 12 .do. Do. 6095 Feb. 8 do 12| .do. Do. 6096 Feb. 8 do 6 .do. Do. 6097 Feb. 8 Off Humacao 10 .do. Do. 6098 Feb. 8 do .do. Do. 6099 Feb. 8 do m .do. Do. 1 A History of Crustacea, 1893. 2 This is, however, not true of the Alpheidx, as the National Museum collection of that family has recently been sent to Dr. H. Coutiere, of the Museum of Natural History, Paris, for study. THE BKACHYUKA AND MACKUKA OF PORTO MOO. 5 Suborder BRACHYURA. The Crabs. Key to the Porto Rican tribes and families of the suborder Brachyura. A. Buccal frame quadrate; efferent branchial channels opening at sides of endostome. B. Carapace usually quadrilateral. Frontal region curved downward. Verges of the male inserted, either in sternal plastron or in the basal joints of fifth pair of legs, thence passing through channels in sternum beneath the abdomen Tribe Catometopa C. Carapace hard and firm. Front, orbits, and eye-stalks not very small. Buccal frame quadrate anteriorly. 1). Last pair of legs not remarkably short nor subdorsal. E. Carapace moderately convex or depressed; branchial regions not greatly dilated. F. Third maxillipeds with palpus articulated usually at front inner angle of merus. Front of moderate width or very narrow. Eye-stalks often greatly elongate Family OCYPOMD* F'. Third maxillipeds with palpus articulated at apex or front outer angle of fourth. Front usually broad. Eye-stalks of moderate size Family GRAPSIB* E'. Carapace very convex, especially dilated over and in front of branchial regions; antcro-lateral margins entire and strongly arcuate. Last joint of walking legs often armecjj with longitudinal rows of spines Family GECARCINID.E D'. Last pair of legs very short and subdorsal Family PALICIDJE C. Carapace more or less membranaceous. Front, orbits, and eye-stalks very small. Buccal frame arcuate anteriorly. Species of small size Family PINNOTHERID.TE B'. Carapace not quadrilateral. Verges of male inserted in basal joints of fifth pair of legs. C. Carapace broad, short, rounded anteriorly, without projecting frontal rostrum Tribe Cyclometopa 1). Terminal joints of last pair of legs not flatly expanded. E. Terminal joints of last pair of legs usually spinuliferous. Species fluviatile, or living in damp earth away from the sea Family POTAMONIDJE E'. Terminal joints of last pair of legs usually unarmed. Species marine Family PILUMNIDJE D'. Terminal joints of last pair of legs usually flatly expanded. Front well separated from inner orbital angles , Family PORTUNIBTE C. Carapace usually triangular, with projecting pointed or spined rostrum Tribe Oxyrhyncha D. Basal joint of antennae well developed, inserted beneath the eyes, and usually forming a great part of intraocular space Family MAHD^E D'. Basal joint of antenna} very small, and with the next joint embedded in the narrow gap between front and inner orbital angle , Family PARTHENOPID;E A/. Buccal frame usually triangular, narrowed forward; efferent channels opening at middle of endostome. Verges of male inserted in basal joints of fifth pair of legs Tribe Oxystomata B.
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