156 PROCEEDINGS OF THE CALIFORNIA 



longer than the third, which are themselves longer than the chelipeds, fourth 

 pair shorter, fifth very short. 



M. M. 



Width of carapax 11 



Length of carapax 5 



Female. Carapax broadly transverse, smooth, shining, margins curved, 

 angles rounded. Outer maxillipeds much larger than in the male just de- 

 scribed, parallel, tomentose. Chelipeds shorter than fourth pair, hand short 

 and rounded, wider than thick, tomentose, propodal finger short, hooked, 

 dactylus oblique, hooked, toothless. Merus, carpus and propodus of all the 

 ambulatory limbs greatly compressed; propodus as long as wide; carpus 

 nearly twice as long as wide; dactylus short, cylindrical, ending in a sharp 

 claw. Abdomen broad, covering the whole sternum, and fringed with long 

 hairs round its margin. The pubescence of the chelipeds is continued along 

 the fingers nearly to their tips, and is found also on the external portions of 

 the carpus and flattened joints of the ambulatory limbs, as well as on the he- 

 patic region. The color, where free froru pubescence, is a brownish yellow 

 (in spirits). 



M. M. 



Length of carapax 7.5 



Width of carapax 14 



A single specimen of each the two crustaceans just described was collected 

 on the same day at the same locality, namely, Angeles Bay, Gulf of Califor- 

 nia, and the two were placed by the collector (Mr. W. J. Fisber) in the same 

 phial. Had it not been for this, I should certainly have never linked 

 together two specimens so distinct in the relative proportions of tbe limbs 

 themselves, as well as of the joints of those limbs; one covered in many 

 places with an abundant pubescence, the other smooth and shining above 

 and below. The proportions of the ambulatory limbs in the female agree 

 with the genus Pinnixa, but in the male the increase of size is transferred to 

 the second pair. Should these Crustacea prove to be distinct the female 

 should be Pinnixa tomentosa, while the male must be placed in some other 

 genus. 



I have no means of ascertaining upon what species of invertebrate animal 

 these Crustacea resided as commensais. 



38. Pinnixa longlpes. (Tubicoia longipes. Lockington, Proc. Cal. Acad. 

 Sci., April 17, 1876.) 



This species should properly be placed in the genus Pinnixa. It possesses 

 the characters of transverse carapax, and elongated fourth pair, in an extra- 

 ordinary degree. 



No. 60. Tomales Bay. (Lockington.) in spirits. 



When I wrote the description of this species, I was not aware that any 

 species of Pinnothere had previously been found quartered upon a worm, but 

 I have since found that Stimpson (Notes on N. Amer. Crust., 21, 23) men- 

 tions two species, both belonging to this genus, that live in similar localities. 



These species are, P. eylindrica, which inhabits the tube of the Chcetopterus, 

 of South Carolina, and P. l&vigata, which lives with the lobworm, Arenicula 

 cristala, in its hole, not lined by any tube, in the sand. 



