4 PROCEEDINGS OF THE CALIFORNIA 



rostrum. Antero-lateral teeth triangular, the two posterior forming a broad 

 ■wing-like expansion. 



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

 ities with Rhod'ia (Bell) and Herbstia (Edwards), but the form of the carapax 

 and of the first joint of outer antennie 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. cordi/Uata,) in the presence of a pre-or- 

 bital s[.iine. 



11 ,, • __^--=^ //uApt iie/ncs cor iicii-ug ^^ 



11. Aln spniosa. uuv^-Kp. ' / j 



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 antennffi short. A long spine, exterior to the antennal base, pro- 

 jecting nearly as far forward as the rostrum. An acute spine on the ui:)per 

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

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

 likeexpausions of the carapax. Of these, the second is the largest, and the 

 third is short anteriorly, but has 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 tiifts of hairs. Chel- 

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

 pair; arm tubercular above, carpus ditto, manus 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. 



U. M. M. M. 



Length of carapax 22 21 



Width of " across lateral exi^ausious 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 Lockingtou. 



12. Pisoides?ceMus. noy^.^ MuTO jjIlVi'^ p UUl^SOiia . Hf^l' ^ 



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

 nent, tnmid; rostrum short, bifid to base; fossettes and inner antennae small; 

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

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

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

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

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

 are two smaller spines. On each branchial region a gi'oup of two or three 

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

 ciliate movable joints of outer antennse as long as rostrum, llagella about 



