ACADEMY OF SCIENCES. 155 



internal borders. Ambulatory legs slender, cylindrical, smooth, dactylus of 

 first pair short, that of second pair about as long as the propodus; those of 

 third and fourth pairs equal in size, rather larger than that of first pair and 

 about half as long as the propodi; that of fourth pair ciliate on its internal 

 margin. Abdomen very large, wider than the carapax and covering the max- 

 illipeds and even the eyes, when folded. 



Several specimens, all females, were collected at Angeles Bay, Gulf of Cal- 

 ifornia, September, 1876, "in oysters." 



c? <P 



M. M. M. M. 



Length of carapax 11.5 9 



Width of carapax 15 12 



Breadth of abdomen 16.5 13.5 



Many of the specimens are loaded with ova. 



35. Fabia svbquadrata. Dana, U. S. Ex. Exp., I, 882, pi. 24, fig 5. Stimp- 



son, Crust. & Echi. P- S. N. A., 30. 

 Puget Sound. Farallone Islands. 



No. 83. In spirits, from mantle of Pachydesma crassitelloides. San Diego, 

 (Hy. Hemphill.) 



36. Dissodactylus nitidus. S. I. Smith, Trans. Conn. Acad. Sci., 1869, 173. 

 Panama. Gulf of California. (Fisher.) 



Two females from the latter locality have the peculiar bifurcate dactyli, 

 from which Mr. S. I. Smith has named the genus Dissodactylus, and prob- 

 ably belong to D. nitidus, of which that author describes the male. The car- 

 apax is firm, somewhat wider at the lateral angles than posteriorly; convex in 

 front and at the margins, without any upturned border along the anterolat- 

 eral margin, but with a short fissure extending obliquely inwards immediately 

 anterior to the lateral angle. The posterior margin has an upturned border. 

 There is no pubescent tuft on the inferior edge of the propodal finger. The 

 ambulatory legs are as in the male. The abdomen resembles that of Pinno- 

 theres, the terminal article reaching and partly covering the buccal frame. The 

 prevailing color is dark purplish brown, with spots of white upon the carapax, 

 and a ring of white at each joint of the limbs. The dactyli are white. 



37. Pinnixa ? nitida. nov. sp. 



Male. Carapax exceedingly transverse, smooth, shining, color in spirits, 

 bright orange; all the limbs smooth and shining, without pubescence, of a 

 straw yellow color. Maxillipeds very small and triangular, closely fitted to 

 the buccal area, smooth and shining, as is also the sternum. Abdomen nar- 

 now at base, second segment rapidly widening, third widest, fourth, fifth and 

 sixth tapering rapidly, seventh almost as long as wide, triangular, with the 

 apex rounded. The abdomen does not cover more than one-half the sternal 

 area. Chelipeds shorter than either second or third pair, the manus broad, 

 with two setose ridges on its anterior surface, fingers short, hooked, toothless, 

 movable finger oblique. Three last joints of ambulatory limbs flattened, car- 

 pus broad at distal extremity, scarcely longer than wide; propodus nearly twice 

 as long as wide; dactylus slender, cylindrical, white, ending in a sharp yellow 

 claw. Margins of last three joints setose, second pair (first ambulatory pair) 



