PSECDAUSTKXIxV. — CRVI'TOSOMA. 209 



{2 inches) ; the hinder part of the foot long and narrow, witli a 

 small niiicous pore overhung by a small lobe. The foot is distinctly 

 divided into three longitudinally. Radula 24 . 1 . 19 . 1 . 19 . 1 . 24 

 (44 . 1 . 44). 



313. Pseudaustenia aiiriformis, Blf. (Vitrina) J. A. S. B. 1866, 2, 

 p. o(j; I'fr. (^'itl•i^a) Mun. Hel. Vj 1868, p. 15 ; Nevill (Helicarion), 

 Hand-l. i, 1878, p. 16 ; Godwin- Austen (Africaiion), Mol. Ind. i, 

 1888, p. 245, pi. 57, fig-. 7 (shell). 



Shell very depressed, oblong-ovate, very thin, smooth, convex 

 without, with a greenish membranaceous epidermis, which pro- 

 jects beyond the peristome, nucleus paler ; spire flat, about 1| 



Fig. 73. — Pseudausfenia aiiriformis. 



whorls. Aperture occupying the whole lower surface of the shell 

 and exposing the interior to the apex. 



Length 13, breadth S, height 2^ mm. 



Hah. Sispara Ghat, Xilgiri Hills. 



Animal not known. The shell differs from that of P. atm by 

 being more oblong and less elliptical, and by the smaller apex, 

 the outline of which projects beyond the margin of the peristome. 



Genus CRYPTOSOMA. 



Cryptosoma, Theobald, J. A. S. B. xxvi, 18.57, p. 252 ; Godioin- 

 'Aiisten, Mol. Ind. i, 1888, p. 14, pi. 4 (animal, shell, and details of 

 anatomy) ; ii, 1898, p. 50 (anatomy). 



Type, C. prcestans, Gould. 



Range. Burma, Siam, and Southern China to Hong-Kong. 



Shell imperforate and with few whorls, like that of Vitrina, 

 and only differing from Helicarion in being thicker, in the last 

 whorl descending, and especially in having a stronger peristome, 

 which, in tlie dry season, is furnished with an epiphragm. 



Animal retractile within the shell. The lobes of the mantle 

 are small as compared \Aith those of Criiptaustenia, and cover a small 

 part of the shell ; right and left shell-lobes united at the back of the 

 shell. A large gland at the posterior termination of the foot without 

 any overhanging lobe. Peripodial groove well developed ; sole of 

 foot in three longitudinal divisions. ■ Generative organs much as 

 in Austenia ; amatorial organ very large, spermatheca cylindrical. 

 Odontophore with much morenumerous lateral teeth than in Indian 



p 



