4 Descriptions of new species of Diplornmatince. [No. 1, 



shells of this genus, it is found to be a common feature in many 

 species, but is not always visible, and more apparent and commoner 

 in some species than in others. In form and size this species much 

 resembles B. Puppensis, W. B 1 f., but is readily distinguished by 

 its fine close costulation, and by the roundness of the aperture, 

 (which is not angulated as in the above and many other species,) 

 and by the thinness of the peristome. 



4. Diplommatina polypleuris, var., Pi. I., fig. 4. 



D. polyplewris, Benson, Journ. Asiat. Soc. Bengal, Vol. XXXVII, Pt. II, 

 1868, p. 83, PL iii, fig. 1. 



Shell dextral, ovate, cylindrical, not rimate, rather thick, pale 

 amber colour, sub translucent, regularly, deeply and rather closely 

 costulated throughout ; spire with sides elevately conoid, apex 

 blunt ; whorls 6^, convex, suture deeply impressed ; the difference 

 between the size of the penultimate and ante-penultimate is 

 scarcely appreciable, and those towards apex decrease very re- 

 gularly ; last whorl scarcely ascending ; aperture vertical, circular ; 

 peristome double, moderately thick ; outer and inner lip equally 

 developed, outer expanded angulate at the base of the columella ; 

 the inner straight, continuous over the penultimate whorl in a 

 thin narrow callus ; constriction in front of aperture. Animal 

 not seen. 



Height, H mm., diam. § mm. ; diam. of aperture, ^ mm. 



Habitat. — North Cachar and north Jaintia hills, in damp woods. 



This peculiar variety is distinguished from D. depressa, which is 

 of about the same size, by its cylindrical form, its greater thickness 

 and opacity, and by its comparative regularity of form, the last 

 whorl scarcely ascending on the penultimate. 



The specimen figured has the columellar tooth but slightly 

 developed, in others it is seen much larger and pointed. 



5. Diplommatina Jaintiaca, n. sp. 



Diplomm. n. sp., Journ. Asiat. Soc, Bengal. Vol. XXXVII, Pfc. II, PI. iii, 

 fig. 3. 



Shell sinistral, elongately ovate, rather tumid, sub -rimate, rich 

 amber colour, sharply very regularly and distantly costulated, 



