ig2i.] Manipur Molluscs. 55^ 



examined the apex is eroded. The whorls of the spire are convex 

 and transverse, narrowly and somewhat obliquely flattened above, 

 and increase in size evenly but rapidlj-. The suture is deeply but 

 narrowly impressed. The body-whorl is almost trumpet-shaped 

 as seen from the dorsal surface but with the mouth deeply 

 depressed. Its periphery is subangulate and the area beneath the 

 imperfectly developed keel is very broadly triangular with the 

 apex of the triangle on the inner m.argin. The upper part of the 

 body-whorl is tumid, but below the peripheral angle, which is 

 better developed than on the closed surface, the base recedes 

 abruptly and is only slightly convex. The aperture is rather 

 small, but relatively broad, oblique in both planes, subrhomboidal 

 and distinctly angulate on the inner margin, bluntly pointed above 

 and narrowly rounded below. The outer lip is thin, broadly and a 

 little irregularly arched. The columella is nearly straight. Its 

 fold is fairly prominent and slightly reflexed over the narrow 



I'"iG. 5. — Type-specimen of Vivipnra micron. 



umbilicus. The peristome is complete. The colour is a rather 

 pale olive-green, tinged with chestnut on the upper part of all the 

 whorls and more deeply so over the whole apex. There is a broad 

 pale band running round the periphery of the body-whorl. The 

 margin of the mouth is very narrowly blackened and the interior 

 of the shell is tinged with white. The sculpture consists of rather 

 coarse longitudinal curved striae crossed hj much finer punctate 

 or sinuate spiral striae. The latter are more conspicuous on the 

 spire than on the body-whorl. 



Measurements (in millimetres) nf Type-shell. 



Height . . . . . . 12 



Max. diam. . . . . ■ • 9 



Height of spire (dorsal) . . • ■ 4'5 



Height of mouth . . . . 67 



Max. diam. of mouth . . . . 5-25 



Type-specimen.— ^o. M 1 1855/2 Zool. Surv. Ind. {Ind. Mus.). 



