66 PROCEEDINGS OF THE CALIFORNIA 



rostrum. Anterolateral teeth triangular, the two posterior forming a broad 

 wing-like expansion. 



The proper place of this genus is evidently among the Pisince, and its affin- 

 ities with Iihodia (Bell) and Herbstia (Edwards), but the form of the carapax 

 and of the first joint of outer antennas does not agree with either, while from 

 the former it differs in having the first pair slightly longer than the second; 

 and from the latter (at least from H. cordyliata,) in the presence of a pre-or- 

 bital spine. 



11. Ala spinosa. nov. sp. 



Carapax with broad lateral expansions rendering it wider than long. Ros- 

 trum, bifid, shorter than the base of the external antenna?. Movable basal 

 points of antenna? short. A long spine, exterior to the antennal base, pro- 

 jecting nearly as far forward as the rostrum. An acute spine on the upper 

 anterior margin of orbit, and a much smaller post-orbital. Antero-lateral 

 spikes three, beside the post orbital; the second and third forming the wing- 

 like expansions of the carapax. Of these, the second is the largest, and the 

 third is short anteriorly, but lias a long thin posterior border. Upper sur- 

 face of rostrum with two rows of hairs.  Ten tufts of hairs on the gastric and 

 intestinal regions, corresponding to the tubercles of those surfaces. Postero- 

 lateral and posterior margins of carapax with a row of tufts of hairs. Chel- 

 ipeds of equal proportions in both sexes, very slightly longer than the second 

 pair; arm tubercular above, carpus ditto, mauus smooth and slender; dactyli 

 in contact, in female, gaping in male; the parts in contact serrated on inner 

 edge, extremities pointed. Hinder pairs beset with spines, each spine ter- 

 minating in a bunch of hairs. Abdomen of female surrounded by a fringe of 

 hairs. 



Localities: La Paz, San Jose Island, Port Escondido, Gulf of California. 



6 P 



M. M. M. M. 



Length of carapax 22 24 



Width of " across lateral expansions. 23 26 



Almost all the specimens are female, their abdomens laden with ova. They 

 were taken in August or September. 



No. 14. Male and female, in spirits. Fisher and Lockington. 



12. Pisoides? celatus. nov. sp. 



Carapax triangular ovate; branchial, cardiac and stomachal regions promi- 

 nent, tumid; rostrum short, bifid to base; fossettes and inner antenna? small; 

 fixed joint of external antenna? very broad, with a long spine as its outer ex- 

 terior border, this spine forming part of the orbit. A spine upon the upper 

 surface of the carapax slightly behind that of the fixed antennal joint, yet 

 somewhat in advance of the eye, this (pre-orbital) spine divided by a trian- 

 gular notch from the post-orbital, behind which, on the antero-lateral border, 

 are two smaller spines. On each branchial region a group of two or three 

 conspicuous spines, and some smaller ones on the posterior margins. The 

 ciliate movable joints of outer antenna? as long as rostrum, fiagella about 



