904 CATALOGUE OF PHANEROPNEUMONA. 
Cyclostoma lunulatum, Mérch. Catal. Conch. p. 8. 
Chondropoma crenulatum, Pfr. in Z. f. MW. 1847, p. 109, n. 6; 
Gray, Cat. Cycl. p. 56, n. 6. 
Chondropoma dentatum, Pfr. Consp. n. 423; Pneum. Mon. p. 286. 
flab. Florida (Say), and the Northern part of Cuba. 
§ 4. Peristome indistinctly double. 
17. CHONDROPOMA HEMIOTUM. 
Shell perforate, oblong-turreted, rather thin, very faintly trellised 
with indistinctly-raised spiral and very close longitudinal lines 
(10-12 of which are collected into single fascicles), not 
shining, fuscous-whitish, painted, for the most part, with red- 
dish-brown interrupted lines and a single broader band below 
the periphery; spire scarcely truncate; suture furnished with 
very crowded minute teeth; whorls 5-7, moderately convex, 
last shortly detached anteriorly, keeled above; aperture rather 
perpendicular, ovate; peristome rather double; inner edge con- 
tinuous, slightly expanded; outer edge descending from the 
middle of the right margin, spreading narrowly, terminated on 
the middle of the left margin into a slightly-waving ,auricula. 
Operculum typical. Length 16, breadth 73 mill. 
Cyclostoma hemiotum, Pfr. in Proc. Z. S. 1852; Ic. n. 396, t. 48, 
f. 3, 4. 
Chondropoma hemiotum, Pfr. Pneum. Mon. p. 288. 
Fab. Haiti (Sallé). 
18. CHonpRoPoMA NEWCOMBIANUM. 
Shell scarcely perforate, oblong-turreted, thin, sculptured with 
raised concentric lines and very close-set longitudinal plaits 
' traversing the ridges (each fourth or fifth being usually 
stronger), diaphanous, slightly shining, fulvous; spire elongate, 
scarcely truncate; suture crenulated; whorls 53-6, moderately 
convex, last nearly cylindrical, shortly detached anteriorly, with 
the spiral striz more distinct and crowded beneath ; aperture 
perpendicular, roundish, slightly angulated; peristome thin, 
indistinctly doubled, expanded shortly into the plane of the 
aperture. Operculum typical. Length 15, breadth 7} mill. 
Cyclostoma Newcombianum, Adams, Contrib. to Conchol. p. 8; 
Pfr. Ic. n. 271, t. 37, f. 25, 26. 
Cyclostoma Troscheli, Pfr. in Z. f. I. 1850, p. 64. 
Cyclostoma Swiftianum, Vewcomb, LSS. 
Chondropoma Newcombianum, Pfr. Consp. n. 424; Pneum. Mon. 
p- 288. 
Hab. W. Indies, the island of St. Thomas. 
