NO. 1876. ON THE CRUSTACEAN ORDER CUM ACE A— CALM AN. 



613 



dorso-lateral ridges first become apparent on tlie third somite. These 

 two pairs of ridges are continued on tlie abdominal somites, becoming 

 less distinct toward the last somite; a more obscure lateral ridge 

 is visible on the penultimate somite. The penultimate thoracic 

 somite has a procurved median ventral tooth. 



Basis of third maxillipeds produced distally into an acute lobe; 

 merus only slightly produced externally; carpus not expanded. 



The first legs have the propodus not tmce as long as the carpus 

 and nearly one-third longer than tlie dactylus. 



The second and third legs carry v/ell-developed exopods, divided 

 into basal portion and flagellum, 

 that of the third a little smaller 

 than that of the second. 



The peduncle of the uropods 

 is longer, by about one-tliird, 

 than the last somite, and bears 

 on its inner edge about seven 

 strong spines with smaller spines 

 between. The exopod is a little 

 more than half as long as the 

 peduncle, its proximal segment 

 half as long (on the outer edge) 

 as the distal ; the endopod is a 

 little shorter than the exopod, 

 its two segments about equal in 

 length. The inner edge of the 

 endopod carries spines and its 

 outer edge seta^; both edges of 



Figs. 7-9. — Heterocuma diomede^, immature fe- 

 male. 7, Anterior part of body from above; 

 S, THIRD maxtlliped; 9, last somite and uropod. 



the exopod are setose distally. 



Immature male. — (Incomplete.) Resembling the female, but with 

 the abdomen stouter and its crests more distinct. Five pairs of 

 pleopods are present. The third and fourth thoracic somites have 

 each a ventral spine, and the pleural plates of the fourth are pro- 

 duced forward in a narrow lobe. 



Remarks. — In having the exopods of the second and third legs well 

 developed and consisting of an expanded peduncle and a segmented 

 flagellum, this species agrees with the male which I described under 

 the name of //. weheri.^ From H. weheri the new species is distin- 

 guished by the tuberculation and by the serrated dorsal crest of the 

 carapace. 



Locality. — Albatross station 3708; off Ose Zaki, Ilonslm Island, 

 Japan; 60-70 fathoms; 1 male (U.S.N.M. 44125), 1 female (holotype, 

 U.S.N.M. 44126). 



1 Cumacea of Siboga Exped., 1905, p. 6, pi. 1, figs. 7-12. 



