1915.] H.B. Preston: Mollusca trom Lake Chilka. 291 
Potamides (Telescopium) fuscum, Schumacher. 
Essat Nouv. Syst., p. 233. 
Outer bar opposite Manikpatna temple. 
Family FOSSARIDAE. 
Chilkaia, gen. n. 
Shell minute, ovate, rimate, with large body whorl and 
aperture, spirally lirate and transversely plicate; operculum ? 
Hab.—Lake Chilka, E. coast of India. 
we 
ear 
Fic. 1t.—Chilkata imitatrix, sp. n. X 10. 
» = (sculpture) X 30. 
Ate 2 —Litiopa (Alaba) copiosa, sp.n. X 8. 
i Cee) i (sculpture) xX 12. 
1 | 6G eenoLhyra tr igona, sp.n. X 14. 
“s ie —Stenothyra obesula, sp.n. X 8. 
» 5-—Epttentum hamatulae, sp. n. X 4. 
Chilkaia imitatrix, sp. n. 
(Figs. 1, 1a.) 
Shell small, oblong ovate, covered with a light reddish 
periostracum; whorls 3, finely and wavily spirally lirate and 
slightly distantly obliquely transversely plicate, the last whorl 
shouldered in the infra-sutural region; suture impressed; perfora- 
tion very narrow; columella whitish, descending in a curve, 
extending above into a thick, white, restricted, parietal callus 
which unites it with the labrum above; labrum acute, a very 
little dilated below; aperture oblique and rather elongately 
ovate. 
