i 9 i6.] 



Fauna of the Chilka Lake : Cumacea. 



399 



spines, whereas in the male the apex is drawn out to a long, sharp, spine-like 

 process, in this respect disagreeing with the diagnosis of the Diastylidae in Stebbing's 

 synopsis of the families of Cumacea. 1 The peculiar structure of the telson of the 

 male may also be proper to some other species of the genus, for the sex is unknown 

 in two out of the three species that have been described. 



Female. — The carapace (text-figs. 3 a, b) is considerably inflated and its breadth 

 is little less than one- third the total length, uropods excluded. The surface is rather 



cc 



s 



Fig. 3. — Paradiastylis culicoides, sp. nov. 9 . 



a. Female in dorsal view. d. Mandible. 



b. Female in lateral view. e. Third maxillipede. 



c. First antenna. /. Telson and uropods. 



g. Telson further enlarged. 



coarsely reticulate and bears only one oblique lateral ridge in place of the three or 

 four which exist in other known species of the genus. The single ridge, which 

 corresponds to the foremost of those found in allied forms, is very strong anteriorly 

 with its edge microscopically spinulose. Posteriorly each ridge approaches, but does 

 not reach, the median line of the carapace ; it is then continued backwards and out- 

 wards, becoming very indistinct in this part of its course. Anteriorly the carapace 



1 Das Tierreich: Cumacea, p. 7 (1913). 



. 



