66 BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



WEST COAST SPECIES. 



holmesi, new species ?Monterey, California $ 



politiis Smith Peru ; Cliile 9 



angelicus Lockington Gulf of California $ 



lithodoml Smith Panama 9 



hipiinctatus Nicolet Chiloe $ 



muliniarum, new species—Lower California $ 



pnyettcnsis Holmes Puget Sound; British Columbia 9 



nudus Holmes Santa Cruz and Monterey, California- 9 



concharnm (Rathbun) British Columbia to San Diego $ 9 



pubcscens (Holmes) Gulf of California 9 



silvestrii Nobili Chile 9 



margarita Smith La Paz ; Panama $ 9 



rcticulatus, new species Gulf of California 9 



taylori, new species British Columbia $ 9 



orcutti, new species Manzanillo $ 



Analogous species of Pinnotheres on opposite sides of the con- 

 tinent: ostreum (Atlantic); holmesi (Pacific). 



PINNOTHERES OSTREUM Say. 

 OYSTER CRAB. 

 Plate 15, figs. 3-6. 



f Pinnotheres pinnopliylax Bosc, Hist. Nat. Crust., vol. 1, an X [1801-2], 

 p. 243 (part), not pi. 6, fig. 3 (after Herbst) nor Cancer pinnophylax 

 Herbst, 17S3 ; coasts of America in Chama lasarus (according to 

 Bosc). As this is a European species of Chama, C. macerophylla 

 Gmelin is doubtless the species indicated. 



Pinnotheres ostreum Say, Journ. Acad. Nat. Sci. Philadelphia, vol. 1, 1817, 

 p. G7, pi. 4, fig. 5, female (type-locality, inhabits the common oyster; 

 type not extant). — De Kay, Nat. Hist. New Yorlj, pt. 6, Crust., 1844, 

 p. 12, pi. 7, fig. 16, female. — Smith, Rept. U. S. Comrar. of Fish and 

 Fisheries, pt. 1, for 1871-72 (1873), p. 546 [252] ; not pi. 1, fig. 2, male. 



f Pinnotheres crassipes Desbonne, in Desbonne and Schramm, Crust. Gua- 

 deloupe, pt. 1, 1S67, p. 43 (type-locality, Guadeloupe, in Ostrea para- 

 sitica; type probably not extant). 



Diagnosis. — First leg of female stoutest, propodus distally wid- 

 ened, dactylus curved, other legs similar to one another, dactylus 

 longer, straighter than in first leg. Carapace thin. Palm very wide 

 just behind distal end. Propodi of all legs in male wide, dactyli 

 longer and more curved than in female. 



Description of female. — Surface glabrous for the most part, 

 smooth, shining; caraj^ace subcircular, with the posterior margin 

 very broad; thin, membranaceous, yielding to the touch, convex 

 from before backward, gastro-cardiac area separated by broad de- 

 pressions from the branchio-hepatic area ; lateral margins thick and 

 bluntly rounded; front about one-seventh as wide as carapace, trun- 

 cate and scarcely advanced in dorsal view, its margin deflexed and 



