104 Bulletin Vanderbilt Marine Museum, Vol. VI 



The female antennular peduncle has the first article about as 

 long as the second and third articles considered together, lami- 

 nate, suboval, with the characteristic vertical leaf-like process 

 on the proximal inner lateral margin, this process tapered distally 

 and extending as far as the eyestalk; the outer lateral margin 

 of this first article has a slight incision approximately opposite 

 the distal apex of this inner lateral process ; the second article is 

 shortest, being three to three and a half times as long as wide ; 

 the third article is 1.7 times as long as the second and is from 5.8 

 to 6.5 times as long as wide. In the adult males the second seg- 

 ment of the antennular peduncle is sometimes, but not always, 

 slenderer in ratio to its length than it is in adult females ; the third 

 peduncular segment of adult males is greatly elongated, being 

 about 1.7 times as long as the related first article and quite slender, 

 being eleven to fourteen times as long as wide. The distinctive 

 characters of the specialization of the male antennular flagellum 

 are figured by Mr. Kemp. There are no adult males in the present 

 series of specimens. 



The female antennular flagellum is two-branched, very fine, 

 the inner, longer whip being about equal to the total body length 

 and distinguished by a characteristic flexure. 



The antennae have the scaphocerite widest proximally, three 

 and one-half to four times as long as the greatest width, with the 

 outer lateral margin quite convex, tapered distally and terminating 

 in a small tooth that extends slightly beyond the rounded, inner, 

 distal margin. In the adult female this scaphocerite extends to 

 about midway the distal peduncular article of the antennulae, or 

 approximately extends beyond the orbit for the distal half of the 

 scaphocerite. 



The mandibular palp and second maxillipeds conform to the 

 generic characterization. The third maxillipeds present a sec- 

 ondary specific character in that the basal segment is moderately 

 stout; when extended forward, these maxillipeds reach beyond 

 the tips of the third pair of legs, and in the females, much beyond 

 the tip of the antennular peduncle. The distal article of the maxil- 

 lipeds is uniarticulate ; the related setae are fairly stout. 



The legs have the basal article fairly stout. The basis of the 

 third pair of legs bears a distinctive large tooth on the inner mar- 

 gin, near the insertion of the ischium. 



