160 Proceedings of the Biological Society of Washington. 



slender, and pointed. Third abdominal segment, lower posterior angle 

 broadly rounded with a small tooth at bottom, mid-lateral margin de- 

 pressed. Fourth and fifth abdominal segments each with three small 

 teeth on posterior dorsal margin. Each of these segments bears two 

 setae, one from the base of either side of the middle tooth. First gnatho- 

 pod with many long curved setae on the lower inside of second joint. 

 Second gnathopod, fifth joint rather short. Sixth joint large and broadly 

 oval. Palm oblique with prominent tooth near finger-hinge and two 

 blunt teeth where palm and posterior margin of joint meet. Palm and 

 posterior margin of sixth joint densely setose. Dactyl strong and curved 

 with row of setules on inner margin. In some specimens the teeth on 

 the palm are very obscure and in some the palm is quite smooth. First 

 and second peraeopods slender, with fifth and sixth joints bearing evenly 

 spaced setae on their hind margins. Third, fourth, and fifth peraeopods 

 with second joint expanded behind into a broad lobe, the hind margin of 

 which is convex in the third and fifth and concave in the second. 

 Mandidle with palp situated at anterior end. Third joint of palp broad 

 and truncated with an indentation near upper end. End and lower 

 margin of third joint, and lower margin of second, provided with long 

 curved setae. Molar prominent. First and second maxillae and maxilli- 

 peds as in the rest of the genus. Epistome produced forward into a 

 point. Upper lip evenly rounded. Lower lip with side-prominences 

 pointed and slightly curved upwards. First uropod longest, rami sub- 

 equal, long, curved, spine on under side of peduncle at base of the rami. 

 Second uropod slightly shorter than first, inner ramus longer. Third 

 uropod shortest, rami subequal. The lower posterior margin of the sixth 

 abdominal segment is produced backwards beneath the peduncle of the 

 third uropod. Telson, simple, about as broad as long, with a shallow 

 concavity in the upper hind margin bordered by two truncated lobes 

 from the upper surface of each of which rises a long spine, and from the 

 ends of which several smaller spines project backward. Lower hind 

 margin of telson without concavity. 



Length. — 5-7 mm. 



Locality. — Venice, Southern California. 



Tj/pe.— Cat. No. 49595, U. S. N. M. 



Female. — Like male except that second gnathopod is smaller, with 

 sixth joint weaker, fifth joint is longer and narrower, and sixth joint is 

 narrower with oblique palm and no palmar teeth. 



