126 CATALOGUE OF PHANEROPNEUMONA. 
XX. OTOPOMA. 
Operculum shelly, solid; whorls convex in the centre, with simple 
edges. Shell conically subglobose or depressed. Aperture sub- 
ovate. Peristome straight or slightly expanded, with the colu- 
mellar margin for the most part dilated, covering part of the 
axis, or closing the umbilicus. 
Otopoma, Gray, Cat. Cycl. p. 35; Pfr. in Z. f. I. 1851, p. 157; 
Consp. p. 29; Pneum. Mon. p. 179. 
Cyclostoma sp., Auctt. 
A..Umbilicus perfectly closed .° . « « §1. ME 
4. Umbilicus more or less open. 
1. Right margin of the peristome expanded. §2. ,, 2-6 
2. Right margin straight. : ; 9 Sy ig ae 
3. Right margin slightly expanded, deeply 
sinuous . ° : ° : : A 99° LO 
§ 1. Avis with the umbilicus perfectly closed. 
1. OroPpoMA CLAUSUM. 
Shell orbiculate-convex, rather solid, slightly and crowdedly 
spirally furrowed above, smooth beneath, flesh-coloured-whitish ; 
spire short, blunt; suture flat, chestnut-coloured in the upper 
whorls; whorls 4, scarcely convex, the last one descending 
anteriorly, rather flattened beneath; aperture oblique, roundish- 
ovate, rather angular above, yellowish inside; peristome simple, 
straight, with distant margins, right margin sinuate, columellar 
margin dilated into a glassy, broad, reflexed lamina, which is 
affixed on all sides, and covers perfectly the umbilicus. Height 
8, greatest breadth 14%, least br. 113 mill. 
Cyclostoma clausum, Sow. Thes. n. 104, p. 128, t. 31, f. 266, 267 ; 
Pfr. Ic. n. 157, p. 147, t. 20, f. 13-15. 
Otopoma clausum, Gray, Cat. Cycl. p. 36, n. 2; Pfr. Consp. n. 260 ; 
Pneum. Mon. p. 179. 
8. Smaller, spire more raised, periphery marked with a single red- 
dish-brown line; height 73, greatest breadth 122, least br. 10 
mill. (Pfr. Ic. t. 42, f. 13-15.) 
Hab. Yemen, Arabia (Powis). 
§ 2. Axis umbilicated; right edge of peristome expanded. 
2. OTOPOMA AURICULARE. B. M. 
Shell turbinate, rather thin, sculptured with crowded and unequal 
spiral furrows, slightly shining, white; spire shortly turbinate, 
rather blunt; whorls 5, convex, enlarging rapidly, last rounded ; 
