272 CALM AN. 



sexes, rather slender, and densely setose. First pair having the 

 carpus longer than the hand, its lower edge convex ; propodus 

 quadrangular, about two and a-half times as long as broad, 

 lower edge convex with a shallow concavity distally behind the 

 prominent anterior corner ; palmar edge very short, transverse, 

 overlapped by the serrated dactyl. Second pair of gnathopoda 

 having the carpus slightly longer than the propodus, its lower 

 edge produced into a rounded lobe ; propodus hardly more 

 than twice as long as broad, shaped as in the first pair, palmar 

 edge somewhat longer but still shorter than the dactyl. First 

 and second pairs of pereiopods similar, basal joint expanded, 

 ovate, twice as long as broad ; merus with its anterior margin 

 expanded and regularly arcuate, produced distally in front and 

 overlapping the carpus for one-fourth of its length. Third pair 

 of pereiopods very short, fourth pair hardly extending to end of 

 carpus of fifth pair which are long and slender. Last pair of 

 uropods not reaching beyond the preceding pair, peduncle three 

 times as long as the rami, outer ramus with two strong hooks, 

 inner ramus lamellate, truncate, bearing setae. Telson triangular, 

 truncate, with a few seta^ on each side. 



Length, about 26 mm. 



The identity of this form with the species observed by Stimp- 

 son is at once suggested by his description of the first two pairs 

 of pereiopods, "with the basal joint very large and much ex- 

 panded, nearly as broad as their epimera ; meros-joint in the 

 same pairs small, compressed, with a sharp arcuated anterior 

 margin." The small size of the " subpediform " gnathopoda in 

 both sexes and other less characteristic points are quite in ac- 

 cordance with our specimens. On the other hand, the superior 

 antenna is stated to be " nearly as long as the body." The in- 

 ferior antenna is ** half as long as the body, with its flagellum 

 no longer than the antepenult joint of the peduncle." Though 

 we should probably read "last" or "penultimate" for "ante- 

 penult," the length of flagellum indicated is still less than in our 

 specimens. It does not seem to us, however, that these dis- 

 crepancies are sufficiently important to prevent the identification 

 of our specimens with the species described by Stimpson. 



