ACADEMY OF SCIENCES. 1 1 



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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.'" 



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. Fabla subqarnlratu. Dana, U. S. Ex. Exp., I, 882, pi. 24, fig 5. Stimp- 

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



Puget Sound. Farallone Islands. 



No. 83. In spirits, from mantle of Fdchydtsma crassitel hides. San Diego, 

 (Hy. Hemphdl.) 



3G. l>isi;od<ictyli(s nitldiis. S.I. Smith, Ti'ans. Conn. Acad. Sci., 1869, 173. 



Panama. Gulf of California. (Fisher.) 



Two females from the latter locality have the i)eculiar bifurcate dactyli, 

 from which Mr. S. I. Smith has named the genus D^ssoddctyias, and prob- 

 ably belong to D. nJtldus, 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 antero-lat- 

 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 jiropodal finger. The 

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

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

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

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

 37. Piuidxii ? idtidd. nov. sp. 



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

 bright orauge; 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 tajjering 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, scarct-ly longer than wide; propodus nearly twice 

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

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



