1.^2 



Records oj the Indian Muscutu. [Vol. XXII, 



1S76. Sfejiothyra Deltae, Theobald, op. cit.. p. 15. 



1888. Stenothyra deltae, with subvars. miKor and ni'iuima 



cit.. p. 43. 

 1915. Stenottivra deltae with subvars. minor and minima, 



cit., p. 79. 



Xcvill, op. 

 Preston, op.- 



S. deltae^ the type-species of the genus, has been described 

 at length by a number of authors, we, however, think it necessary 

 to note its distinctive characters once again : — The ventral surface 

 of the body whorl is flattened, and the shell is oruamented with 

 spiral punctured lines; the mouth is very small, subcircular with 

 merely the trace of a notch above ; the peristome, though cjuite 

 continuous, is very little raised above the surface of the body- 

 whorl and, though not at all incrassate, hardly thinner than the 



shell immediately inside the lip. In 

 some specimens the periostracum is 

 very thick and bears traces of spines 

 arranged in spiral lines. They are 

 probably present in the young. 



The radula has been figured by 

 Troschel. 



We aie not aware of the location of 

 the types, but some of the specimens 

 preserved in the collections of the 

 Zoological Survey were presented by 

 Benson. The species occurs far above 

 the area of tidal influence in pure 

 fresh water as well as in brackish water. 

 In the Indian Museum, it is represented 

 by specimens from Port Canning, Calcutta (Chandipal Ghat), Patna 

 and Bhagalpur. 



Text-fig. 2. — Stenothyya del- 

 tae ( Benson), side view of the 

 shell to show the compressed 

 nature of the same in the 

 dorso- ventral. 



Stenothyra foveolata, Benson. 



1856. Sfenotliyra foveolata. Benson, op. cit., p. 497- 



1858. Stenothyra foveolata, .\dams, H. and A., op. cit., p. 626. 



1S76. Stenothyra' foveolata (as Nematura in Syst. Ind.), Hanley and 



Theobald, op. cit., p. 17, pi- x.Nxvii, dg. 3. 

 1876. Stenothyra foveolata. Theobald, op. cit., p. 15. 

 1858. Stenothyra foveolata, with var. minor, Nevill, op. cit., p. 44. 

 1915. Stenothyra foveolata whh'\:u. minor, Preston, op. cit., pp. 80, 



Si. 



Benson described this species from a single specimen giving a 

 full description but no figure. Hanley and Theobald, however, 

 later figured the unique type. In the collections of the Indian 

 Museum there is a single specimen collected at Sikrigalli by Dr. T. 

 Oldham. Nevill considered it to belong to a new variety, which 

 he named minor, but did not describe. We have compared the 

 specimen with Benson's description and with Hanley and Theo- 

 bald's figure and consider it to be an almost typical specimen of 

 the species, differing from Benson's description only in being a 

 little smaller and in the body-whorl being less swollen. Owing to 

 erosion the sculpture unfortunately is not clearly to be made out. 



