4S MR. A. O. WALKEfi ON AMl'HIPODA 



two segments ; the 2nd shorter than the 3rd. Head rather 

 longer than the 1st segment ; Lateral angle acute. Eyes oval, 

 dark. 



Upper antenna3 : the 1st joint three times as long as the next 

 two, the peduncle naked except for a few scattered hairs. 

 Plagellum about as long as the peduncle, 9-jointed, with a few 

 long-jointed setaB ; the 1st joint entirely naked, as long as tlie 3rd 

 and longer than the 2nd joint. Accessory appendage 4-joiuted, 

 the 1st joint as long as the 3rd and longer than the 2nd. 



Lower auteunse a little longer than the upper, the peduncle 

 nearly twice as long as the 8-jointed flagellum, the first two joints 

 subequal and each nearly twice as long as the last ; the whole 

 very sparsely setose. 



First gnathopods : the 1st joint as long as all the rest; carpus 

 two-thirds the length of the rectangular propodos : posterior 

 margins of the 3rd, 4th, and 5th joints pilose, the rest of the 

 limb sparsely setose. Side-plates expanded below. 



Secoud gnathopods normal. 



First and second peraeopods with the 1st joint as long as the 

 next three; dactyl us about one-third the length of the 5th 

 joint. 



Third perseopods : the 1st joint widening out gradually from 

 the base to a cycloidal lobe, about as broad as long, the hind 

 margin scarcely serrate ; the side-plates more than twice as 

 large as the 1st joint, deeper than wide. 



Fovirth and fifth perffiopods : the 1st joint deeper than v^de, 

 scarcely serrate. 



Uropods : the 1st Extending beyond the 2nd and these beyond 

 the 3rd ; the first two pairs almost naked, with the outer ramus 

 longer than the inner. The 3rd pair have the peduncle longer 

 than the inner ramus, which is quite smooth ; the outer has one 

 or two spines on the inner margin. 



Telson concave above, pointed and divided to about one-third 

 of its length. 



Incubatory lamellae very narrow. Branchial vesicles pyriform. 



Length 6 mm. 



iNear 0. tninuta (Kroyer), but differs in the form of the 

 urosome and telson, and in the small and naked 1st joint of the 

 flagellum of the upper antennae. 



