30 CATALOGUE OF PHANEROPNEUMONA. 
10. PrerocycLos NANUS. 
Shell depressed, discoidal, whitish, painted with a peripherical 
chestnut-coloured band and waving streaks above; spire slightly 
prominent, darker; whorls 43, convex, the last one detached 
above; umbilicus deep and open; aperture oblique, circular ; 
peristome double, with the edges scarcely separated by a slightly- 
Impressed groove; inner edge deeply and straightly indented 
above; outer edge slightly reflexed, forming, above the sinus, a 
narrow vaulted wing, which is shortly descending and angulated 
anteriorly. Operculum? Height 5, breadth 10 mill. (Senson.) 
Pterocyclos nanus, Benson, in Ann. d& Mag. N. H. 2nd ser. viii. p. 
450; Pfr. Pneum. Monogr. p. 47; Le. t. 49, f. 31-33. 
Hab. India, the Nilgherries Mountains. 
11. PrrrocycLos PARVUS. B. M. 
Shell depressed, rather solid, slightly striate, horn-coloured-yellow- 
ish, with chestnut-coloured angular stripes above and a den- 
ticulated band of the same colour at the periphery; spire nearly 
flat, with the apex scarcely elevated; whorls 43, moderately 
convex, the last one cylindrical, descending anteriorly, paler 
beneath ; wmbilicus broad; aperture oblique, circular; peri- 
stome double; inner edge shortly produced, emarginate above 
by a nearly circular sinus; outer edge rather broad, reflected, 
white, angularly receding, ascending and dilated into the shape 
of a cap over the sinus. Operc.? Height 5, greatest breadth 
14, least br. 113 mill. 
Spiraculum parvum, Pearson, in Journ. As. Soe. ii. p. 392, t. 20. 
Pterocyclos parvus, Bens. in Journ. As. Soc. v. p. 357; Ann. & 
Mag. 2nd ser. i. p. 346; Pfr. in Z. f. M. 1851, p. 5; Le. t. 31, f. 
12-14; Consp.n. 54; Pneum. Mon. p. 48. 
Cyclostoma spiraculum var., Sow. Thes. t. 31, f. 273 ? 
Pterocyclos rupestris (part.), Gray, Cat. Cycl. 12, n. 3. 
Hab. India, the Khasya Hills (Benson). 
12. Prerocycios CuMINGI. 
Shell depressed, solid, slightly striate, shining, fulvous-yellow, with 
angular chestuut-coloured stripes, which are broader and darker 
near the periphery, so as to form two interrupted bands ; spire 
flat; whorls 5, convex, the last one cylindrical, swollen ante- 
riorly next the penult one into an elongated ridge, which is 
rounded above and surrounded by a furrow; umbilicus very 
broad ; aperture a little oblique, nearly circular, pearly inside ; 
peristome rather simple, white, thickened, reflected, interrupted 
above by a triangular incisure, and produced into a small 
inflected tongue. Opere. typical, with a small, blunt nucleus. 
Height 6, greatest breadth 32, least br. 28 mill. 
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