CHYPTAUSTENIA. 185 



a margin of black on the side of the elongate kidney and the 

 visceral sac is darkly mottled. The mucous gland linear, extremity 

 of foot square. Shell-lobes black, the right shell-lobe broad and 

 spreading along the side of the body-whorl ; the left shell-lobe 

 also a broad lappet and elongately triangular in shape. The male 

 organ resembles that of Austenia gigas, and the amatorial organ is 

 larger. 



Jaw with a very small central projection. 



Radula has the formula : 



70 . 2 15 . 1 . 15 . 2 . 70 



87 . 1 . 87 



The central tooth and the admedian teeth are of the usual form : 

 the central tooth as drawn is malformed or broken, it is only the 

 remnant of the usual tricuspid form ; the laterals are evenly 

 bicuspid.] 



[282. Cryptaustenia zemoensis, Godwin-Austen (Austenia), Mol. Ind. 

 ii, 1907, p. 171, pi. 107, figs. 4-9. 



Locality. Zemo Samdong, Sikkim ( W. Robert). 



Shell rather depressedly globose, thin and membranous ; sculp- 

 ture none, a smooth shiny epidermis ; colour ochraceous with a 

 green tinge ; spire low, rounded, apex just raised above the next 

 whorl ; whorls 3, gradually increasing, the last rounded and tumid ; 

 aperture and peristome not seen (broken below). 



Its form is very similar to a species from Darjiling in Dr. W. 

 T. Blanford's collection, figured on pi. 37, figs. 2, 2 a, vol. i. 

 p. 152 (Mol. Ind.), as Austenia ? salius, Bs., var., a smaller or more 

 solid shell. 



Size : major diam. 11-3, alt. axis 6 mm. 



The shell is of the type of A. planospira, but may be distin- 

 guished at once by the coil of the whorls, there being more of 

 them. The shell is so thin and delicate, I found it impossible to 

 detach it from the animals preserved in spirit. 



Animal. Of similar form, to A. planospira ; the principal dif- 

 ference is noticeable in the shell-lobes, which in this species are 

 quite smooth, whereas in planospira they are strongly papillate. 

 The left shell-lobe shows a scalloped edge, with furrows running 

 inwards towards the edge of the mantle. The left dorsal lobe is 

 distinctly in two parts. The sides of the foot and mantle-lobes 

 are mottled, but not strongly, and one specimen shows this only 

 slightly on the shell-lobes. The sole of the foot is divided, but 

 the segmental lines on the side do not extend across the central 

 portion as in A. gigas and other species. The fringe of the foot 

 is paler than the rest of the animal, from the peripodial groove to 

 the edge of the foot. 



The generative organs are interesting, because in the penis 

 there is a solid coiled rounded mass at the main bend, from which 

 the retractor muscle is given off, and in this respect this species 



