I9I9-] H. H. Godwin-Austen : Fossarulus in India. 211 



before. This interesting species has a limited range in Southern 

 India, which was a land surface in pre-Cretaceous times, during 

 which its early development possibly took place. 



Mysoria, gen. nov. 



Type : Bithynia costigera, Kiister, var. curta, Nevill. 



Range. South India and Ce3don. 



Shell perforately rimate, ovately conical or depressedly coni- 

 cal, solid, longitudinally striate, having 3 markedly birate ribs 

 above with 2 below the periphery, aperture sub-circular, continu- 

 ous ; peristome simple, somewhat thickened on the columella side. 

 Operculum not like that of Bithynia. Calcareous, not very thick, 

 sub-circular or broadly ovate, centre concave, nucleus small with 

 indication of spiral origin 



Radula. Centre tooth quadrate with a centre cusp and 3 or 4 

 adjacent. Lateral tooth elongate, narrow at base gradually widen- 

 ing to a many cusped straight edge. First marginal of same length, 



Fig. 2. — Mvsoi'ia costigera (Kiistei") var. cui'fa (N'evill). 

 Operculum, x 8. a. Internal view. h. External view. 



narrower, edge finely serrate; 2nd same length, narrow throughout, 

 edge rounded, finely serrate. 



Touching Dr. Annandale's reference (see below) to the genus 

 Cremnoconchus there is certainly in C. syhadrensis, W. Blf. from 

 Bombay a very curious resemblance, so much so that an examina- 

 tion of its radula and other parts of the animal is much wanted, 

 although William Blanford gave a very good account of it, it re- 

 mains to be properly dissected. I am in hopes Dr. Annandale ' will 

 be able to do this, and better define the position of this genus, 

 with its peculiar amphibious habits. 



Under date 15th June, Calcutta, Dr. Annandale writes to me : 

 ' * I have examined the radula and the operculum of my specimens 

 of Bithvnia costigera var. curia, and enclose a note upon them. 

 Have you noticed the extraordinary superficial resemblance be- 



' Since this was written Dr. Baini Prashad and I have published notes on 

 and figures of this species. See. Rec. hid. ^fus. y.\'\, pp. 148, 149, pi. iv, figs. 

 2-4 (1910). .V. Annandale, i6-ii-l9. 



