i 9 i6.] 



Fauna of the Chilka Lake : Terrestrial Isopoda. 



477 



slightly convex sides to the subacute apex. The second pleopod of the male (fig. 27) 

 has the exopod similar to that of the first, but with the apex rather more acute and 

 with a fringe of fine setae on the inner margin near the apex in addition to the 

 spinules; the endopod has a fairly broad base and narrows abruptly at about one- 

 fourth its length from the base, and then tapers gradually to the very acute point 

 with a constriction about one-third its length from the extremity, which reaches 

 slightly beyond the apex of the exopod. 



In the 3rd, 4th and 5th pleopods (fig. 28), the exopods are similar in general 

 appearance to those of the ist and 2nd, and the endopods show the usual branchial 

 structure and have the margins free from setae. 



In none of the exopods is there a special respiratory tree-like structure or 

 c ' trachea," but probably there are special modifications which enable them to act as 

 organs for breathing dry atmospheric air as is the case in Oniscus (see Stoller, 1899, 

 p. 24). 



The terminal segment and the uropods agree with the description given by 

 Budde-IyUnd and are on the whole similar to the figure given by Dollfus for his 

 Anomaloniscus ovatus. 



Hemiporcellio carinatus, Collinge. 

 (Figs. 29 to 32). 



Hemiporcellio carinatus, Collinge, 1915, p. 145, pi. vi, figs. 1-10. 



Barkuda Island, L,ake Chilka Survey, Station 26. No. -ff- 3 -. Two specimens. 



I have no hesitation in referring these two specimens to the above species, the 

 type of which was collected at Rambha under stones, etc., at the edge of Iyake 

 Chilka. 



The species is placed by Collinge in the new genus Hemiporcellio, which includes 

 a closely allied species H. hispidus, Col- 

 linge, also from L,ake Chilka district, 

 and H. immsi (Collinge) from Allahabad. 

 As yet, however, no diagnosis of the 

 genus as distinct from the species has 

 been given. 



The two specimens now under con- 

 sideration agree well with the description 

 and figures given by Collinge. One that 

 I have partially dissected proves to be a 

 male, and I am therefore able to give the 

 sexual characters. 



The legs are all nearly of the same 

 length, the seventh pair being only slight- 

 ly longer than the first. In the first (fig. 

 30) the carpus is slightly expanded and 



Hemiporcellio carinatus, Collinge. 

 Fig. 29. — Second antenna. 



Fig. 30. — First leg of male. 

 bears on the inner margin a very dense covering of setae, most of which are slightly 



