172 CEYLON PEAKL OYSTER REPORT. 



The first legs (fig. Gl) are somewhat longer and more slender than in the female; 

 the basal segment bears on its inner edge a group of spines, and the dactylus is a 

 little shorter than carpus or propodus. The remaining legs do not differ conspicuously 

 from those of the female. 



The uropods (fig. 66) have the peduncle fringed on the inner edge with setse. The 

 exopod is a little longer than the endopod and equal to the peduncle, and has a few 

 plumose hairs on its inner edge. The endopod has about 23 spinules on its inner 

 edge, diminishing in length distally, and leaving the distal third of its length 

 unarmed. Both rami are simply pointed at the tip. 



Localities. Gulf of Manaar, various parts of the Cheval Paar ; depth 7 fathoms ; 

 several specimens. 



This species approaches most closely to C. levis, Thombon, and C. argus, Zimmer. 

 The latter is distinguished in the male sex by a different form of the anterior margin 

 of the carapace, the antennal notch being widely open and shallow, by having the 

 second leg-bearing somite produced dorsally, and by the shorter uropods, of which 

 the peduncle is equal in length to the last somite. C. levis is distinguished, according 

 to Thomson, by having a long, slender and acute process from the distal end of the 

 basal segment of the first legs. I am inclined to suspect some eixor of observation in 

 regard to this character, in which case C. levis would resemble very closely the form 

 here described. The characters of the uropods, however, appear to distinguish the 

 species, those of C. levis having the peduncle not longer than the last somite, and 

 their armature being somewhat different. 



Cyclaspis hornelli, n. sp. Plate IV., figs. 67 to 71. 



Closely resembling in both sexes the preceding species, but differing from it in the 

 following characters : The carapace is still smoother, and the dorsal keel is simple 

 and less strongly marked. The first legs (fig. 67) are much longer, reaching far 

 beyond the anterior end of the body ; the basis is about three-fourths of the length 

 of the remaining segments together, and the propodus is twice and the dactylus one 

 and a half times as long as the carpus. The second legs (fig. 68) have the terminal 

 segment longer and with more numerous spines. In the last three pairs of legs the 

 distal segments are more elongated, the carpus of the fifth pair (fig. 70) being half as 

 long again as the merus. The unypods (fig. 71) resemble those of C. herdmani, but 

 the exopod is a little shorter than the peduncle, and bears three to five spinules 

 about the middle of its inner margin, while at the tip are two unequal spinules and 

 another close to them on the inner edge. The endopod is simply pointed and bears 

 in the female six, and in the male 14 spines on its inner edge. Total length, female 

 5 '3 millims., male 4"2 millims. 



Localities. Gulf of Manaar, Cheval Paar, depth 7 fathoms, several spp., and the 

 Periya Paar Kerrai, depth 8 to 9 fathoms, several. 



At the suggestion of Professor Herdman, I have pleasure in associating with this 



