192 1.] Manipur Molluscs. 603 



Manipur Valley, not being known from elsewhere, I. scofe'wrt and /. 

 lima are found in Burma, Assam and Eastern Bengal, while I. 

 bonneaudi and /. occatiis have a very wide range. 



Indonaia occata (Lea). 



1914. Noiiiitai-ia (Nodiilaria) occata, Simpson, Descr. Cat. Naiades, p. 



1915. Nodiila:-ia{Nodtilaria)occata, Preston, Faun. Bi-it. Ind. Fresh~v.- 



Moll., pp. 1.^8, 139. 



The specimens from the Manipur Valley closely resemble those 

 of this species from other parts of India and I have no hesitation 

 in assigning them to it. 



The soft-parts resemble those of /. caerulea var gaudichaudi 

 described by me in the piper cited, but differ in having the palps 

 much longer and ellipsoid in outline, in the anal being compara- 

 tively larger, but of about the same size as the supra-anal and in 

 the mantle connection between the supra-anal, and anal being very 

 small. None of the specimens are gravid but all the four gills 

 have a marsupial structure. 



Preston {loc. cit ) gives ''Bengal" as the range of distribution 

 of this species. There are, however, specimens from various loca- 

 lities in the United Provinces, the Central Provinces, Bengal, Assam 

 and Burma in the Indian Museum collection. The species, there- 

 fore, has a very wide range in India and Burma. 



Indonaia bonneaudi (Eydoux). 



IUI4. Nodnlaria (Nod-.ilarid') bonneaudi, Simpson, op. cit., p. 9811. 

 1915. Nodularia {Nodnlaria) bonneandi, Preston, o_{). c;Y., pp. 140, 141. 



Preston has referred to the great variation exhibited by this 

 species both as regards shape and in colour, and this is well brought 

 out in the series before me. 



The soft parts resemble those of 7. occata except that the 

 branchial aperture is much larger, and the anal and supra-anal, 

 which are of the same size, are about one half of its length. The 

 palpi are very elongate, somewhat triangular in outline aad have 

 a sharp tip. Only the outer pair of gills are fully charged with glo- 

 chidia, and the inner prir have only a small number in them. 



There are only two sp-cimens of this spjcies in the collection, 

 one from the Thobal Stream near Phaidai and the other from Sikmai 

 stream six miles from Kakchm on the Manipur-Burma Road. 



Indonaia scobina (Hanley). 



1856. Unio scobina, Hanley, Recent Biv. Shells, p. 382, pi. xxiii, fig;. 40. 

 1876. Unio scobina, Manley and 1 heobald, ConcJi. Jndica, p. 22, pi. 

 xlvi, fig. 2. 



1914. Nodnlaria {Nodnlaria) scobina, Simpson, op. cit., p. 996. 



1915. Nodularia (Nodularia) scobina, Preston, op. c;Y., pp. 142, r43. 



This species was originally described from a unique specimen 

 from Assam. Hanley and Theobald have given a good figure of the 



