CYCLOPHORIDZ. 149 
aperture nearly perpendicular, circular, fulvous within; peri- 
stome continuous, white, broadly expanded and shortly re- 
flected, shortly affixed to the penult whorl. Operculum shelly, 
rather concave externally. Height 15, greatest breadth 22, 
least br. 163 mill. 
Cyclostoma megacheilus, Sow. Thes. n. 114, p. 131, t. 31, f. 276. 
(Not Pot. d& Mich.) 
Cyclostoma Sowerbyi, Pfr. in Z. f. Jf. 1847, p. 58; Jc. n. 151, 
p. 143, t. 19, f. 10-12. 
Cyclophorus? Sowerbyi, Pfr. in Z. f. MM. 1847, p. 107, n. 12; 
Gray, Cat. Cycl. p. 18, n. 12. 
Cyclostomus Sowerbyi, Pfr. Consp. n. 309; Pneum. Mon. p. 212. 
Locality unknown. 
§ 6. Shell not keeled, globose-turbinate; peristome narrow, reflected. 
38. CYCLOSTOMUS APLUSTRE. 
Shell globose-turbinate, thin, slightly decussated with very crowded 
strie of growth and spiral lines, not shining, white, marked 
above with five or six fuscous bands; spire turbinate, rather 
pointed; whorls 53, convex, increasing rapidly, last cylindrical, 
not descending, rather uniformly white beneath; umbilicus 
middle-sized, deep; aperture oblique, roundish, rather angu- 
lated, with the bands chestnut-coloured within ; peristome sim- 
ple, thin, interrupted, shortly expanded, with the columellar 
margin shortly dilated and reflected. Operculum? Height 22, 
greatest breadth 29, least br. 25 mill. 
Cyclostoma aplustre, Sow. in Proc. Z. 8. 1849, p.15; Moll. t. 2, 
mao; Pfr. tc. n: 230, t. 33, f. 5, 7. 
Tropidophora aplustris, Gray, Cat. Cycl. p. 40, n. 7. 
Cyclostomus aplustre, Pfr. Consp. n. 310; Pneum. Mon. p. 212. 
Hab. Madagascar. 
39. CYCLOSTOMUS ASPER, B. M. 
Shell subglobose, conical, solid, slightly decussated by the striz 
of growth andycrowded spiral furrows, fulvous; spire conoidal, 
slightly truncate; whorls 5, convex, the upper ones pale, the 
last girdled with one whitish band on the periphery and with a 
fuscous band below the other; aperture rather circular, brown 
within; peristome expanded, white, with the margins approxi- 
mate, joined by a slightly-indented callus; columellar margin 
dilated, reflexed. Height 20, greatest breadth 28, least br. 22 
mill. 
Cyclostoma asperum, Potiez & Mich. Gal. Douat, i. p. 233, t. 28, 
f, 15,16; Pfr. Ic. n. 86, p. 90, t. 11, £. 3, 4. 
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