96 



C. CHILTON. 



Fig. 20. Cubaris helmsianus, ventral 

 view of anterior part of head showing 

 epistome, first antenna and upper lip. 



Fig. 21. Cubaris helmsianus, 

 second antenna. 



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Fig. 22. Cubarus helmsianus, dorsal view of 

 posterior portion of pleon and uropoda. 



First segment of peraeoo 

 longer than the others, its 

 side-plate produced anter- 

 iorly beyond the eyes and 

 nearly to the level of the 

 anterior margin of the 

 head, this portion recurved 

 so as to be nearly hori- 

 zontal, posteriorly it ex- 

 tends in a triangular lobe 

 with rounded apex nearly to the. 

 level of the posterior margin of 

 the second segment. Side plates 

 of the first and second segments 

 with margins thin, inner surface 

 with a slight ridge ending in a 

 small tooth. Second, third, and 

 fourth sideplates rather narrow, 

 each with an oblique ridge run- 

 ning downwards and backwards 

 on the outer surface, fifth, sixth 

 and seventh sideplates progress- 

 ively broader and with the ridge 

 less distinct. 



Sideplates of the 

 third, fourth, and 

 fifth segments of 

 pleon well devel- 

 oped, broad, rect- 

 angular. Terminal 

 segment (fig. 22) 

 longer than broad, 

 constricted near 

 the middle, pos- 

 terior margin 



