126 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



Second abdominal segment with postero-lateral angle produced 

 into a small acute triangular process. 



First uropods with rami equal and about as long as peduncle ; 

 second pair with rami longer than peduncle and with inner ramus 

 longer than outer; terminal pair with ramus slightly longer than 

 peduncle. 



Length 15 mm. 



Miss Smallwood, in Cold Spring Harbor Monographs, No. i, 

 regards this species and the preceding as different stages of the 

 same form, megalophthalma being a younger stage of longicornis. 

 Aside from the difference in the length of the antennae, however, 

 upon which Miss Smallwood bases her conclusions very largely, 

 the two species differ from each other in the size of the eyes, 

 the different form of the second gnathopod of the males, the 

 longer ramus of the third uropod of megalophthalma, and by the 

 triangular process on the postero-lateral angle of the second 

 abdominal segment. 



Distribution : This species has the same range as the preced- 

 ing and occurs in similar situations but is far less common than 

 longicornus. Noank and New Haven, Connecticut. 



Hyale H. Rathke. 



Fourth coxal plates much deeper than fifth. First antennae 

 longer than peduncle of second. 



First maxillae with uniarticulate palp reaching to base of 

 apical spines of outer plate. Maxillipeds with four- jointed palp. 



Second gnathopods in male with carpus small and masked 

 behind by the merus ; in female carpus produced behind, between 

 adjacent segments. 



Third uropods uniramous. Telson unarmed, divided to base. 



Hyale prevostii (Milne-Edwards). 



1830. Amphithoe prevostii, Milne-Edwards, Ann. d. Sci. 

 Nat. vol. 20, p. 378. 



1888. Hyale prevostii, Stebbing, Rep. Voy. "Challenger," 

 vol. 29, p. 144. 



Back smooth, coxal plates with lower margins smooth; first 

 pair widened below. 



Eyes small, round. 



