I9I5-] 



Fauna of the Chilka Lake : Crustacea Decapoda. 



277 



Sex. 



Second peraeopod : 

 Ischium. Merus. Carpus. 



length 

 Palm. 



I 

 Dactylus. 



? 



i-8 



i - 4 



1-75 



•9 



ro 



9 



i'5 



1*2 



i'4 



7 



7 



2 



i-5 



1*0 



1 '4 



7 



•8 



9 



i'4 



I'l 



1-4 



•8 



"9 



9 



i-3 



n 



1 '4 



7 



•8 



c? 



1-2 



•9 



1-2 



■6 



•65 



cf 



ro 



7 



I"0 



'4 



'4 



The fingers are provided with inturned claws and with a few setae placed distally, 

 but are without teeth on the cutting margins. There are no spines on any of the 

 segments. 



The third peraeopods reach almost or quite to the end of the antennular peduncle; 

 those of the fifth pair are a little longer. In all the last three pairs the posterior 

 margins of the propodi bear tufts of longish setae and the dactylus is naked and 

 biunguiculate, bearing a slender spine near the apex (text-fig. 26/). In those of the 

 fifth pair the ischium and carpus are of equal length ; the carpus is a little more than 

 half the length of the merus and a little less than half the length of the propodus ; 

 the latter segment is rather less than four times as long as the dactylus. 



The abdominal somites are smooth; the third is somewhat strongly arched in 

 lateral view and overhangs the succeeding somite. The sixth somite is about twice 

 the length of the fifth and is a little longer than the telson. 



Both uropods extend beyond the apex of the telson, the outer being the longer 

 and about three and a half times as long as broad (text-fig. 26 A). The telson is nar- 

 row with two pairs of dorso-lateral spinules. The apex (text-fig. 26g) is produced in 

 the middle to a bluntly rounded lobe and bears three pairs of spinules. The tips of 

 the inmost pair fall only a little short of those of the intermediate pair, the outer- 

 most being much the shortest. 



Large ovigerous females reach a length of nearly 16 mm. 



Urocaris indica is very closely allied to U. infraspinis , Rathbun 1 , from California 

 and the Pacific coast of Mexico. It agrees with this species and differs from U. longi- 

 caudata, Stimpson ', the type of the genus, in possessing an antennal spine and a 

 well defined ocellus at the base of the cornea. The characters separating Urocaris 

 infraspinis from the form found on the Indian coasts appear to be as follows : — 



1 Rathbun, Proc. U. S- Nat. Mus., XXIV, p. 903 (1902) and Harriman Alaska Expect., X, p. 31, 

 text-figs, io«, b (1910). 



% This species, examples of which I have examined, is recorded from the West Indies and the adja- 

 cent eastern coast of America. See Stimpson, Proc Acad. Nat. Sei. Philadelphia, XII, p. 39 (i860) and 

 Rathbun, Bull. U.S. Fish Comm. for 1900, XX, ii, p. 126 (1902). 



