I9I5] 



Fauna of the Chilka Lake : Crustacea Decapoda. 



287 



the palm ; they gape shghtly at the base when the daw is closed and their cutting 

 margins are entire. Setae are thinly scattered on the lower edges of the ischium and 

 merus ' and on both margins of the carpus; on the chelae they are more numerous. 



The second peraeopods (text-fig. 306) reach a little beyond the tips of the eyes, 

 the carpus, as in 0. occidentalis and 0. sibogae, being composed of four segments. 

 The proportional lengths of ischium, merus, carpus and chela are as 13, 20, 22 and 

 10. Of the four segments which compose the carpus, the first is very long, nearly 

 one and a third times the length of the three following combined ; the second and 

 fourth are nearly equal in length, almost twice as long as the third. The fingers 



Fig. 20-—0gyrides striaiicauda, sp. nov. 



a. First peraeopod. d. Sternal process at base of 4th peraeopods. 



b. Second peraeopod. e. Fifth peraeopod. 



c. Third peraeopod.'' /. Telson and right uropods from above. 



(?. Telson from below. 



are a little more than one and a half times the length of the palm. The limb bears 

 setae on the distal part of the carpus and on the chela. 



Of the last three pairs of peraeopods the fourth is the longest, reaching as far 

 forwards as the first, the third (text-fig. 30c) is the stoutest and the fifth (text-fig. 30^) 

 the most slender. In the third and fourth pairs the dactylus^ is very small; the 



' These are not shown in test-fig. 30^. 



* The dactylus of the third peraeopod is not well shown in text-fig. 30c ; it is very much more 

 slender than the propodus and about one-third its length, bearing two short setae apically. The figure 

 conveys the erroneous impression that the dactylus is absent and that the propodus bears two long 

 setae, which are crossed, at its apex. 



