MOLLUSCA OF INDIA. 149 
Avsrents pLanosptra, Benson. (Plate XXXVI. figs. 1-5 d, Plate 
XXXVIII. figs. 1-1 6.) 
Vitrina planospira, Benson, A. M. N. Hist. 1859, iii. p. 271; 
Pfr. Mon. Hel. vol. v. p. 14. 
Vitrina succinea 2, Reeve, Conch. Icon. Vitrina, f. 8. 
Helicarion (sec. C) planospira, Theob. Supp. Cat. p. 24. 
Helicarion succineus, Reeve=planospira, Bs. Ney. Hand-list, p. 14. 
Locality. Damsang Peak, Daling Hills (W. Robert). 
Shell imperforate, very depressedly globose, rather swollen, thin, 
diaphanous, horny, polished ; surface perfectly smooth ; colour bright 
bronzy olive ; spire rounded, scarcely raised above the last whorl ; 
suture shallow; whorls 8, rapidly increasing ; aperture oblique, 
broadly and horizontally ovate ; peristome curving forward above, 
sinuate; columellar margin nearly perpendicular, but weakly deve- 
loped. 
Size: major diam. 13-5, minor diam. 10°3, alt. axis 4°5 mm. 
i 0°53, ‘ 0-40 ,, 0:18 inch, 
Original description :—* Testa suborbiculato-depressa, peripheria 
rotundato-ovata, tenui, levigata, obsolete arcuato-striatula, translu- 
cente, polita, cornea ; spira conveviuscula, superne planata, sutura 
canaliculato-marginata ; anfractibus 3, celeriter accrescentibus, ultimo 
antice depresso, leviter descendente, ad peripheriam compresse rotun- 
dato, subtus convexiusculo ; apertura valde obliqua, ovato ?-lunari, 
peristomate tenui, superne antrorsum arcuato, margine columellarr 
valde arcuato. 
« Diam. major 14, minor 11, axis 5 mill. 
‘ Habitat ad Pankabari et in valle Rungun, Vitrine salit consors, 
Taro occurrens. 
‘Only two dead and imperfect specimens were collected by Mr. 
W.T. Blanford. The species is remarkable for the sudden flatness 
of the upper part of the spire, and for the neat shallow canaliculate 
suture. It was found in company with a variety of the smaller and 
more convex Vitrina salius, B., which Mr. Theobald had previously 
taken alive on the Khasia Hills.” 
A specimen from Darjiling has been capitally drawn by Stoliczka’s 
native artist, and I give a copy of it (Plate XXXVI. fig. 1). It re- 
presents the body as olive-brown in colour, and upon the coarsely 
papillate mantle and the size I make this identification. Mr. W. 
Robert’s collection from Darjiling contains a number of well-pre- 
served specimens, and I can now give a description of the animal 
(vide figs. 2 & 3). The right dorsal lobe is of the usual form, the 
left moderately broad, with a slight reentering contraction on the 
left frontal margin. The right shell-lobe is broad, with a strongly 
papillate surface, some of the projections being nipple-lke, as ob- 
served in A. verrucosa, G.-A., from the Dafla Hills (J. A. 8. B. 1876, 
p. 318, pl. viii. f. 5). The left shell-lobe is also papillate, and con 
tinuous all round to the right; it is broad in front, overlapping 
the peristome, but it narrows suddenly on the left middle margin. 
