I9I5-] 



H. B. Preston: Mollusca, V. 



541 



fourth and fifth regularly increasing, the sixth large, tumid, the 

 last contracted and abandoning the direction of the axis of the 

 shell, sculptured with coarse, obsolete, oblique, transverse costu- 

 lae; suture well impressed; columella margin vertically descending, 

 bearing a strong, downwardly bent, entering lamella above, 

 sharply angled at the base, diffused above into a thick, outwardly 

 expanded, well-defined, parietal callus which joins the upper mar- 

 gin of the labrum and gives to it a continuous appearance ; lab- 

 rum consisting of an outwardly expanded and slightly reflexed, 

 shelf-like projection from which springs an erect, rather thick rim ; 

 aperture subcircular 



Fig. 4. — Bitliynia dibrugarlieiisis, sp. n., X 4. 

 5. — Diplojiimatiiia perobesa, sp. n., X 6. 

 5rt. — do., sculpture, X 12. 



Alt. 4"5, diam. maj. 25 mm. 

 Aperture: alt. i'25, diam. i"5 (nearly) mm. 

 Hab. — Upper Rotung, at an altitude of 2000 ft., under stems 

 of plantain trees (5. W . Kemp). 



Raphaulus assamicus, G. Austen. 



L. e- F. \V. Moll. India, I, p. 2(ii, pi. \lvii, figs. 3-3a. 



Rotung, at an altitude of 1300 ft., in rotten wood ; Upper 

 Rotung (5. W. Kemp). 



Appears to vary somewhat in size among individual speci- 

 mens. 



