CYCLOPHORIDA. 115 
14. CHoANOPoMA ? PRieTREI. 
Shell turbinate, thin, sculptured with distant longitudinal lamellz, 
crossed by transverse rows of prickles, uniformly white ; spire 
conical, often slightly truncate; whorls 4-6, convex, the last 
detached anteriorly, descending obliquely; umbilicus middle- 
sized, pervious, spirally ridged internally; aperture nearly 
circular ; peristome double; inner edge sharp, shortly pro- 
duced ; outer edge waved, shortly expanded into the plane of 
the aperture. Operc.? Length 8, breadth 5 mill. 
Cyclostoma Pretrei, Orbigny, Moll. Cub. i. p. 260, t. 22, f. 9-11; 
Sow. Thes. n. 136, p. 139, t. 31, f. 260; Pfr. Ic. n. 166, p. 154, 
t. 21, f. 9-12. 
Choanopoma Pretrei, Gray, Cat. Cycl. p. 51, n. 18; Pfr. Consp. 
n. 236; Pnewm. Mon. p. 168. 
Hab, Cuba. 
§ 3. Shell globose-conic ; outer edge of peristome flat. 
15. CHOANOPOMA INTERRUPTUM. B. M. 
Shell perforate, ovate-conic, usually truncate, rather thin, smooth, 
shining, whitish, painted with 6-8 interrupted yellow bands ; 
whorls 5, ventricose, the upper ones slightly longitudinally 
ribbed, violaceous-brownish, the last one cylindrical ; aperture 
rather perpendicular, circular, of the same colour inside ; peri- 
stome indistinctly double; inner edge short, obsolete; outer edge 
nearly continuous, arcuately emarginate on the penultimate 
whorl, broadly expanded otherwise, slightly concave anteriorly, 
with the upper margin angulated and somewhat inflexed; 
columellar margin dilated, expanded, not covering the narrow 
umbilicus. Operculum of few whorls, with the margin of the 
second whorl detached. Length 23, breadth 15 mill. 
Cyclostoma interrupta, Lam. Hist. vi. p. 145, n. 10 ; £d. Desh. viii. 
p. 356. 
Cyclostoma ambigua, Deless. Recueil. t. 29, f.5; Reeve, Conch. Syst. 
t. 183, f. 8; Chenu, Lll. Conch. t. 1, f. 5. 
Cyclostoma interruptum, Voigt, in Cuv. Thierr. ii. p. 178; Sow. 
Thes. n. 141, p. 141, t. 28, f..152; Pfr. Jc. n. 58, p. 63, ¢. 9, 
£3, 2. 
Choanopoma interruptum, Gray, Cat. Cycl. p. 53, n. 27; Pfr. 
Consp. n. 237 5 Pneum. Mon. p. 164. 
Hab. Jamaica. 
16. CHOANOPOMA LIMA. B. M. 
Shell oblong-turbinate, truncate, closely and coarsely trelliced by 
crowded spiral and longitudinal raised lines, purplish-brown ; 
