MOLLUSCA OF INDIA. 169 
signis, of the Naga Hills, which shows the central tooth to be 7- 
cuspid and the three laterals to be 5-cuspid. The formula being 
3 —|— 3 
Sb Hoshi Oh TE Ve Seer oie o' 
This radula is of very considerable length comparatively. See 
fig. 5, r. 
The buccal plate (fig. 5) can be well seen in some specimens, and 
consists, net, as in the Helicidx, of one solid horny mass with a 
cutting-edge, but of a multitudinous series of quadriform plates, 
slightly overlapping, and having a sort of tooth on the free angle, 
a modification of development really similar to that of the radula. 
In this example (fig. 5) what I take to be otoliths were distinctly 
visible, situated in a sac near the base of the tentacles. 
Operculum paucispiral, thin, shelly, brittle, and transparent. 
Diplommatine are numerous where found, generally among decay- 
ing leaves, on which they are easily detected, and sometimes on the 
damp surface of limestone rocks they creep about in hundreds. 
Species from the Western and Eastern Himalayas, &c. 
DIPLOMMATINA BLANFORDIANA, Benson. (Plate XLIX. figs. 10, 
10a.) 
Locality. Damsang Peak, W. Bhutan Hills. 
Diplommatina blanfordiana, Benson, A. M. N. H. 1860, vol. v. 
p. 460 (Darjiling); Journ. A. 8S. B. 1868, p. 83, pl. i. figs. 8, 8a; 
Pfr. Mon. Pneum. vol. iii. p. 9; Theob. Supp. Cat. p. 41. 
Diplommatina blanfordi, Bs., Hanley, Conch. Ind. p. 49, pl. exix. 
figs. 5&6; Nevill, Hand-list, p. 267. 
Original description :—‘‘ Testa deatrorsa, foveato-rimata, ovato- 
acuminata, confertim arcuato-costulata, albida, spira ovato-pyranu- 
data, superne attenuata, apice acutiusculo, sutura impressa ; anfracti- 
bus 74 convexis, antepenultimo majusculo tumido, ultimo antice 
ascendente; apertura subverticali, late auriculart, plica columellari 
valida nutante munita, peristomate expanso, extus varice retrorelicta 
remotiuscula valida aucto, infra ad sinistram subangulato, marginibus 
callo parietali crasso expanso appresso junctis, columellari leviter 
sinuato. Opere. ? 
“Long 44, diam. 25 mill. 
“¢ Hab. prope Darjiling. Teste W. T. Blanford. 
‘“‘ Independently of its smaller size and stronger costulation, this 
shell is distinguished from D. pachycheilus by its foveate rimation 
behind the thin columellar lip, and by the retrorelict variciform 
second peristome, which is remote in its course, on the right side, 
from the thin actual peristome, but joims it below the umbilical 
