i82 Records of the Indian Museum. [Vol. X, 



barrel-shaped buccal capsule and the caudal spurs, are not of great 

 systematic importance since the former may well be lost during 

 one of the moultings and the latter are doubtless converted into 

 caudal papillae such as occur in widely separated genera, e.g. 

 Filaria (F. papulosa^ Rud.) and Dacnitis {D. calHchroi, mihi), 

 CucuUanus (C elegans, Zed.). 



The mouth capsule might point to genera : 



(i) Angiostomat Duj. No species of this genus have been 

 recorded from fishes^ the larvae might however belong to a species 

 parasitic in Umax, e.g., A. limacis, Duj. The shape of the oeso- 

 phagus however renders this identification unjustifiable (compare 

 larvae of ^. macrostonmut, V. lyinstow (6) p. 325, see also Neuhaus 



(17), P- 653)- 



(2) Cucullanus. There is however no longitudinal striation 

 as in the larva of C. elegans figured in Schneider (ig) PI. xxvi, 

 fig. 10. The oesophagus of Cucullanus is also characteristically 

 divided into two sections. 



(3) Leptodera, Schneider {=Leptodera, Duj. Angiostoma, 

 Duj. and Rhahditis , Duj , ex parte). The oesophagus is furnished 

 with one or two dilatations (Schneider (19) p. 156). 



(4) Dacnitis. The buccal capsule might alter to form the 

 cuticular collar of this genus, but the oesophagus is again quite 

 different in form. 



12. Oncholaimus indicus, v. lyinstow. 

 (PI. xxiii, figs. 66-70.) 



This species was described for the first time by v. Linstow in 

 1907 {Kec. Ind. Mus., Vol. I, p. 45). The specimens at the dis- 

 posal of this distinguished observer do not appear to have shown 

 clearly certain important characters of the head. Consequently a 

 redescription will not be out of place. 



The species occurs among filamentous algae and sponges in 

 pools of brackish water at Port Canning in I^ower Bengal and also 

 in a canal of brackish water on the outskirts of Calcutta. 



General shape (fig. 66). Tapers very gradually to both ends. 

 The head is truncated. Shortly behind the anus the body 



