﻿The STjmpoda. 151 



teeth, the rest and all iii the female smooth ; sixth segment not 

 much shorter than the fifth, and near the uropods much wider ; the 

 telson rather longer than both combined, evenly cylindrical for about 

 seven-ninths of its length, then narrowing over the anal valves to the 

 truncate apex which is occupied by a pair of rather large spines ; the 

 sides of the telson are serrate in the upper half, but smooth near 

 the base and in the lower half. 



First antennae with long peduncle, stout in the male, first joint 

 dentate at the apex, second equally long, third much shorter, slender 

 in the female, stout in the male, flagellura slender, joints seemingly 

 four, with the usual long setae at apex, accessory with 2 joints and a 

 very long apical seta at least in the male, in which sex there is a 

 fascicle of sensory filaments attached to a broad process at the base 

 of the flagella, possibly representing the first joint of the principal 

 flagellum. Second antennae four-jointed in the female, carrying 

 seven plumose setae, terminal joint very small, sometimes in geni- 

 culate attachment. In the male the penultimate joint of the peduncle 

 has a proximal tooth on the outer margin ; the outer margin of the 

 long last joint is fringed with very small tufts of setules. 



Upper lip emarginate. Lower lip with the lobes apparently deeply 

 indented on the inner margin. 



Mandibles with strong molar, spine-row with spines as many as 

 twenty, or sometimes rather fewer, one mandible with an accessory 

 plate and the principal plate minutely quadridentate, the other 

 mandible without accessory plate and narrower principal. 



First maxillge with inner plate broad, five spines on its narrow 

 apex ; the palp not very long, with two apical setae. Second maxillae 

 seemingly with undivided distal plate, carrying numerous spines on 

 the distal margin and one on the lateral surface, the slightly 

 projecting basal lobe fringed with very numerous short setae. 



First maxillipeds like the maxillae of very delicate texture, the 

 epipod voluminous, in the male carrying numerous branchial leaves, 

 general structure as in Diastylis. Second maxillipeds with second 

 joint rather broad, nearly as long as the rest combined, carrying two 

 plumose setae at the apex of each margin, third joint distinct, very 

 small. In the females with well-packed ovaries no fan of vibratory 

 setae was discovered, but in place of the fans a pair of long simple 

 processes with some apical setules. Third maxillipeds with second 

 joint much longer than the rest combined, much curved, strongly 

 produced at the outer apex, which is rounded and furnished with five 

 long plumose setae, the fourth to the seventh joints differing little in 

 leagth but the last two much the narrower. 



