CYCLOSTOMID^. 28T 



upper posterior end of the foot. Indian. G. tomotrema, Benson 

 (Ixxvi, 98). 



DiTROPis, Blanford. Shell subvitreous, translucent, with 

 revolving carinas, one of which is on the periphery. Operculum 

 with the margins of the whorls raised. Indian. G. convexus, 

 Blanf. (Ixxvi, 99). 



ACROPTYCHiA, Crosse and Fischer. (Euptychia, C. and F.) 

 Shell giobosely turbinate, thin, longitudinally ribbed ; aperture 

 snbovate-circular, the margin shortly expanded ; umbilicated. 

 Operculum corneous, paucispiral. 1 sp. Madagascar. G.metableta^ 

 C. and F. (Ixxvi, 100, 1). 



Leptopoma, Pfeiffer. 



Distr. — 65 sp. E. Indies, Philippines, Australia. L. perplexum^ 

 Sowb. (Ixxvi, 2.) L. acutimarginatwm^ Pfr. (Ixxvi, 11). 



Shell turbinated, globular or conic, narrowly umbilicated; 

 aperture rounded; peristome nearly continuous, single or double, 

 reflected. Operculum flattened, membranous. 



DERMATOCERA, H. and A. Adams. Animal with a conical 

 epidermal horn on the hind-part of the foot. L. vitreum, Lesson 

 (Ixxvi, 3, 4). 



LEUCOPTYCHiA, Crosse. Shell thinly costate longitudinally, 

 and with several spiral striae. G. Tissotianum, Crosse (Ixxvi, 5). 



AuLOPOMA, Troschel. 

 Distr. — 4 sp. Ceylon. A. Itieri, Gruerin (Ixxvi, 6), 

 Shell depressed, turbinated or subdiscoidal, the last whorl 

 anteriorly detached; peristome free, straight, continuous. Oper- 

 culum corneous, larger than the aperture of the shell, and having 

 a circular groove to receive the margin of the latter. 



Craspedopoma, Pfeiff"er. 



Syn. — Bolania, Gray. 



Distr. — 9 sp. Canaries, Madeira. C. lucidum, Sowb. (Ixxvi, 7). 



Shell subturbinated, rimate, the last whorl subcontracted an- 

 teriorly. Operculum round, horny, externally plane, internally 

 concave with a submarginal ridge. 



V. Gyclotea. 



Operculum more or less thick, formed of two lamina, internally 

 corneous, externally calcareous, multispiral. 



Cyathopoma, Blanford. 



Distr. — 10 sp. India, Mauritius, Seychelles. G. Deccanense, 

 Blanf. flxxvii, 8, 9). 



Shell minute, umbilicated, turbinated, or somewhat depressed; 

 epidermis thick, sometimes hispid, smooth, spirally striated, or 



