1921.] N. Annandale & B. Pkashad : I ndi iii Molluscs. 131 



subovoid, except that the body- whorl, in ventral view, is sHghtly 

 angulate on the outer side. The apex in the unique type is eroded 

 and appears bluntly rounded. There are only 4 whorls. The 

 suture is faintly impressed, but regular and somewhat oblique. 

 The whorls increase very rapidly ; the first one is very minute, 

 the second is much larger and only slightly swollen, the penulti- 

 mate whorl is band shaped and moderately swollen. The body- 

 whorl is large and in dorsal view sub-rhomboidal ; in this view 

 the right side is nearly straight to about half its length and then 

 suddenly slopes down to the base, the opposite side is regularly 

 curved except for a slight angulation about the middle. In 

 ventral view the body-whorl is nearly fiat in the anterior f of its 

 length. The mouth is subcircular, rather small , being less than \ 

 of the size of the body- whorl ; its margin is slightly reflected but 

 does not project very much above the surface of the shell. The 

 shell is not umbilicate, but has a very prominent boss as in the 

 other species of the genus. Owing partially to erosion and parti- 

 ally to a deposit on the surface the sculpture is not clear all over 

 the surface, but on certain parts of the penultimate whorl 6 — 7 

 spiral rows of punctured lines are distinctlj- to be made out. 



Measurements of type-shell (in millimetres). 



Length . . . . . . 2"2 



Breadth of the body-whorl . . . . I'g 



Spire (dorsal view) .. .. I'l 



Aperture . . . . . . 7 



Type-specimen. — No. 2196 in the collections of the Zoological 

 Survey of India (Indian Museum). 



Locality. — A single specimen was collected by the late Mr. G . 

 Nevill at Chandipal, Calcutta. 



Remarks. — Nevill, in the paper cited above, did not give this 

 species any name nor did he publish a description of it ; with the 

 specimen, however, there is a label with the above name, which I 

 have adopted. 



The species belongs to the group of S. deltac, but differs in 

 its very small size, in having a very short spire with a rounded 

 apex and relatively larger aperture. 



Stenothyra deltae (Benson). 



1836. Nematuva Deltae, Benson, Jotirn. As. Soc. Bengal. V, p. 782. 



1837. Nematura Dellae, Sowcrby, op. cit., pp. 216, 2/7, figs, a, a. 



1856. Stenothyra Deltae, Benson, op. cit., p. 4.99. 



1857. Nematura Deltae, Troschel, Gebiss der Schnecken. I, p. 104, pi. 



vii, fig. II. 



1858. Nematura Deltae, ,\dams, H. and .\.. op. cit.. I, p. 342. pi. .\xxv, 



fig. s, and II, p. 626. 

 1862. Nematura deltae, von Frauenfeld, op. cit., p. 1159. 

 1865. Stenothyra deltae, Slimpson, op. cit., p. 40. 

 1876. Stenothyra Deltae, (.ns .Nematura in Syst. /ndi. Hanley and 



Theobald, Conch Ind.. p. 17, pi. \xxvii. fig. J. 



