1916.] S. Kemp : Notes on Crustacea Decapoda. 403 



Hippolysmata ensirostris, Kemp. 



1914. Hippolysmata eitsirosfris, Kemp, Rec. Ind. Mus., X, p. 118, 

 pi. vii.figs. 1-4. 



A number of very interesting larval and post-larval specimens 

 belonging to this species have recently been found off the Orissa 

 coast. The post-larval specimens are about 14 to 16 mm. in length 

 and in most of their characters agree closely with adults. The 

 rostrum, however, is much shorter, usually not reaching the end 

 of the antennal scale and the peraeopods, though well-formed, 

 with perfect chelae, and with apparently the full number of sub- 

 segments in the carpus of the second, possess rudimentary exopods 

 on all pairs except the last. The apex of the telson is compara- 



FiG. 5. — Hippolysmata ensirostris, Kemp. 

 I/ate larval stage. 



tively broad, with a pair of long spines that extend beyond the 

 small median point by more than half their length. These spines 

 appear to dwindle slowly in the course of further development and, 

 though not mentioned in my original description, traces of them 

 may still be found in specimens 40 mm. in length 



Judging by the number of teeth on the basal crest of the 

 rostrum, these post-larval specimens belong to H. eiisirostris rather 

 than to its variety punctata. 



Other specimens, found with the above, almost certainly 

 represent the same species in its last larval stage, but show re- 

 markable differences in structure (text-fig. 5). The rostrum is 

 short, dorsally convex and bears teeth onl}^ on its dorsal margin 

 and that on the carapace, which is deeply grooved oa either side 



