CYCLOSTOMID.A, 287 
upper posterior end of the foot. Indian. C.tomotrema, Benson 
(Ixxvi, 98). 
pirropis, Blanford. Shell subvitreous, translucent, with 
revolving carinz, one of which is on the periphery. Operculum 
with the margins of the whorls raised. Indian. C. convexrus, 
Blanf. (Ixxvi, 99). 
ACROPTYCHIA, Crosse and Fischer. (Euptychia, C. and F.) 
Shell globosely turbinate, thin, longitudinally ribbed; aperture 
subovate-circular, the margin shortly expanded; umbilicated. 
Operculum corneous, paucispiral. 1sp. Madagascar. C.metableta, 
C. and F. (Ixxvi, 100, 1). 
Lepropoma, Pfeiffer. 
Distr.—b5 sp. E. Indies, Philippines, Australia. L. perplexum, 
Sowb. (Ixxvi, 2.) ZL. acutimarginatum, 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. ZL. vitreuwm, Lesson 
(Ixxvi, 3,4). 
LEUcOPTYcHIA, Crosse. Shell thinly costate longitudinally, 
and with several spiral strie. C. Tissotianwm, Crosse (1xxvi, 5). 
AvuLopoma, Troschel. 
Distr.—4 sp. Ceylon. A. Itiert, Guerin (1xxvi, 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. 
CrasPEDOPpoMA, Pfeiffer. 
Syn.— Bolania, Gray. 
Distr.—9 sp. Canaries, Madeira. C. lucidum, Sowb. (1xxvi, 7). 
Shell subturbinated, rimate, the last whorl subcontracted an- 
teriorly. Opereulum round, horny, externally plane, internally 
concave with a submarginal ridge. 
V. Cyclotea. 
Operculum more or less thick, formed of two lamina, internally 
corneous, externally calcareous, multispiral. 
CyatHoroma, Blanford. 
Distr.—10 sp. India, Mauritius, Seychelles. CC. Deccanense, 
Blanf. (lxxvii, 8, 9). 
Shell minute, umbilicated, turbinated, or somewhat depressed ; 
epidermis thick, sometimes hispid, smooth, spirally striated, or 
