1870.] Descriptions of new species of Diplommatinm. 3 



vexity, ante-penultimate much the largest and tumid ; last whorl rises 

 on the penultimate, almost to the suture, contracting the breadth of 

 latter excessively ; aperture vertical, broadly auriculate ; peristome 

 solid, double, the outer lip thick and strong, interrupted; the 

 inner continuous, spreading in a broadly appressed parietal callus 

 upwards on the sinistral side ; columellar tooth large and thick ; base 

 prominent, descending. 



Operculum and animal not observed. 



Height, \\ mm. ; diameter, f- mm. ; diameter of aperture, \ mm. 



Habitat. — Woods at Jawai, Jaintia Hills ; also at Lailangkote, 

 about 4000 feet, where the specimens were larger. 



The small size, few whorls, impressed suture, obtuse apex &c. dis- 

 tinguish this form readily. As in the preceding species, the last 

 whorl rises rapidly on the penultimate, and to a greater extent 

 than in most species of this genus. In all these characters, it ex- 

 hibits a nearer approach to Opisthostoma than any species ofDiplom- 

 yet described. 



3. Diplommatina Sherfaiensis, n. sp. Pi. L, fig. 3. 



Shell dextral, ovate, fusiform, sub-rimate, thin, rubescent straw 

 colour, diaphanous ; sculpture very fine, close, filiform, shewing well 

 on all the whorls ; spire with sides slightly convex, apex sub- 

 acuminate, conic ; whorls 6, convex, penultimate and ante-penul- 

 timate of very nearly the same size, the former being slightly the 

 largest and more tumid ; last whorl constricted in front of peris- 

 tome above the aperture, ascending ; aperture sub- vertical, columellar 

 margin much rounded, the tooth very small, and in some old speci- 

 mens is hardly to be detected ; peristome thin, double and close, 

 the outer very slightly expanded, the inner distinctly so, continuous, 

 forming a thin broad parietal callus. Animal not observed. 



Height, 3 mm. ; diameter, If mm. ; diameter of aperture, f- mm. 



Hahitat. — On the highest ridges of the north Cachar hills, parti- 

 cularly the peaks " Sherfaisip" and " Marangksi," about 5,500 

 feet, in dense forest ; I have named it after the former, a culminat- 

 ing point of the range. 



In figure 3b, of this species, the constriction on the penultimate 

 whorl has been shewn. When looking over a large number of 



