346 Memoirs of the Indian Museum. [Vol. V, 



are compared, the number will suffer reduction. It is noteworthy that we found no 

 specimens of Hydrobia myliacea or Stenothyra blanfordiana, both of which were 

 recorded many years ago from the Chilka L,ake and are abundant in other localities. 

 Unfortunately we have no information as to the part of the lake in which they were 

 found. 



Hydrobia and Stenothyra are the only genera of Molluscs represented in the fauna 

 of the lake that can be said to have limnic affinities. 



Hydrobia (Belgrandia) myliacea , Nevill, Journ. As. Soc. Bengal (2), XLJX, p. 161 

 and L, p. 158, pi. vii, fig. 7 (1880-1881). 



Nevill records from the Chilka Lake specimens of a form of this species to which 

 he gave, without description, the name " subvar. subangulata." Both this form and 

 the typical one were found at Port Canning in the Gangetic delta. 



Stenothyra blanfordiana, Nevill, Journ. As. Soc. Bengal (2), XLJX, p. 160 (1880) 

 and Iy, p. 156, pi. vii, fig. 10 (1881). 



This species, which was not recognized by Mr. Preston among the specimens we 

 sent him from the Chilka Lake, was described from it by Nevill in 1880. The same 

 author also recorded the species from Port Canning in the Gangetic delta and from 

 Madras. He noted that specimens from the former locality agreed more closely with 

 individuals from the lake than did those from Madras. In parts of the Gangetic 

 delta it is very abundant among weeds. 



Stenothyra minima (Sowerby), Preston, Faun. Brit. Ind., Freshw. Moll., p. 81 



(I9I5)- 

 We found this species common among weeds in both parts of the lake-system on 

 both a muddy and a sandy bottom and at all times of the year. It was originally 

 described from western India. 



Stenothyra chilkaënsis* Preston, 1914, p. 300, fig. i; 1915, p. 293. 

 S. chilkaënsis is even more common in the lake than the preceding species, 

 together with which it occurs. 



Stenothyra orissaensis* Preston, 1914, p. 300, fig. 2; 1915, p. 293. 

 This form occurs with the two preceding ; it is perhaps no more than a variety 

 of 5. chilkaënsis. 



Stenothyra trigona* Preston, 1915, p. 293, fig. 3. 



Occurred with the preceding species, but was not found in the outer channel in 

 the salt-water season. 



Stenothyra obesula* Preston, 1915, p. 293, fig. 4. 



S. obesula is represented in our collection by a single specimen only; it was 

 obtained in the outer channel in the freshwater season on a bottom of muddy sand. 



Family Scalariidae. 



Epitonium hamatulae ,* Preston, 1915, p. 294, fig. 5. 



A single dead shell of this species (the type) was found in the outer channel off 

 Barhampur I. in the freshwater season. Its small size renders its introduction by a 



