I92I.] 



Manipur Molluscs. 



613 



than the outer and the outer pair being a little shorter in length. 

 The palpi, however, are comparatively larger. 



OG. 



S.v 



'•-F. 



I.G. 



Fig. 32. — Soft parts of Corbiciila occidens, Deshayes. 

 F. foot ; I.G. inner ^ill ; M. mantle ; O.G. outer g-ill ; P. palp : 5'. siphons. 



Many specimens of this species were obtained by the Manipur 

 Survey party from a muddy channel flowing into the Loktak Lake 

 near Potsengbam Bungalow. Specimens were also collected from 

 various other streams in the Manipur Valley. 



Corbicula striatella, Deshayes. 



1854. Coybicnla slyiafella, Deshayes, Proc.Zool.Soc. London XXII, 



P- 344- 

 1867. Corbicula striatella, Prime, An>i. Lyceum Nat. Hist. N. York 

 VII, p. 74, fig. 22. 



This species is not confined to Pondicherry and Bind as 

 Preston states, but is fairly common all over India. The only 

 specimens in the present collection are from a small stream near 

 Waikhong on the Manipur-Burma Road. 



The sinus of the pallial line is much better marked in this 

 species than in C. occidens, and the siphons and siphonal retractor 

 muscles are accordingly much better developed and distinctly 

 marked olif from the pallial muscle. I hope to elaborate this point 

 for the other Indian species in another place. 



The soft parts, except for the differences noted above, are 

 like those of C. occidens. 



Corbicula subradiata, Prime. 



1867. Corbicula subradiata. Prime, op. cit., p. 75, fig. 2T,. 

 1915. Corbicula subradiata, Preston, op. cit., p. 213. 



The precise locality from which the tj'pe-specimens of this 

 species were obtained is not given by Prime. In the Conchologia 

 Indica Hanley and Theobald state that they never obtained any 

 specimens of this species and consider it and C. agrensis to be prob- 



