no. 1654. AMPHIPODA FROM WEST NORTH AMERICA— HOLMES. 537 



which decrease in size toward the median edge, where there occurs a 

 single small spine; the rounded outer angle is more or less serrate 

 and furnished with slender spines. The plates of the second maxillae 



Pig, 41. Stilipes distincta. a, anterior taut of body; i>, end of abdomen; tnd.r, 



RIGHT MANDIBLE; )ii,i u FIRST MAXILLA; MXa, SECOND MAXILLA. 



are nearly round, subequal in size, and furnished with numerous 

 setae, among which are several strong, slightly curved spines. The 

 maxillipeds have the inner plates nearly rectangular with the trans- 

 verse distal margin setose; outer plates ovaKseto.se, 

 but devoid of spines; palp with the first and third 

 joints of subequal length, and a little shorter than 

 the second; fourth joint short and claw-like. 



First gnathopods with the carpus longer and 

 much broader than the hand, which is oblong, 

 densely setose and simple, or very imperfectly sub- 

 chelate. Second gnathopods longer than the first : 

 carpus elongate, hand narrow, distally tapering, 

 much longer than in the first pair and simple. 

 First and second peraeopods, with the exception of 

 the coxa! plates, similar in size and shape; pos- 

 terior margins armed with numerous short stout 

 distincta, i.i:i-r man spines, dactyls short and curved. The lasl pairs 

 ""'" : of peraeopods are elongate, the basal joint i- pro 



duced distally into a rounded lobe, the dactyls are straight: those of 

 the last pair much elongate and armed with several spinules. 



