WEST AMERICAN CRUSTACEA, 583 



bears a setose lobe at the base. The peduncles of the an- 

 tennse are shorter than those of the antennules and have the 

 last joint about as broad as long; the scale is shorter than 

 the peduncle and extends as far forward as the tip of the 

 penultimate joint of the antennules; the flagellum seldom 

 exceeds one-half the length of the body. The mandibles 

 have a molar tubercle and a dentate cutting edge; the 

 second joint of the long palp is arcuate and longer and 

 much broader than the third, which is slender and tapers 

 to a subacute tip. First maxill£E normal. Second max- 

 illce with three oblong masticatory lobes and a subovate 

 exognath which bears 13-16 marginal seta? ; second joint 

 of palp oblong-ovate. 



Maxillipeds with broad basal joints; the exopod much 

 longer than the endopod, the terminal portion divided 

 into numerous (fifteen in specimens) articulations; the 

 terminal joint of the endopod is rounded, thickly setose 

 and devoid of a claw. The gnathopods closely resemble 

 the maxillipeds but the endopod is larger and the termi- 

 nal joint is subacute. The following pair of appendages 

 has the endopods longer than the exopods; the terminal 

 portion is longer than the preceding joint and divided, in 

 several specimens examined, into ten to thirteen setifer- 

 ous articulations. The remaining thoracic legs are simi- 

 lar to the pair of appendages just described, 



Pleopods rudimentary in the female, mostly shorter 

 than the width of the abdominal segments to which they 

 are joined and bearing a minute outer branch. The first 

 pair is longer than the others and bears two short, sub- 

 equal rami at the tip of the relatively long peduncle. 



In the male the first pleopods have an oval peduncle 

 which is furnished with plumose set« along the outer 

 margin ; the outer ramus is longer than the peduncle and 

 is divided into several setiferous articulations; the inner 



