CYCLOPHORID A. 205 
19. CHonpROPOMA? TURRITUM. 
Shell subperforate, turreted, slightly truncate, trellised regularly 
with spiral and longitudinal raised lines, whitish, girdled with 
interrupted reddish-brown lines; suture rather deep, closely 
denticulated; whorls remaining 6, moderately convex, in- 
creasing regularly, last rounded, furnished beneath with strong 
spiral ridges; aperture perpendicular, ovate, fulvous within ; 
peristome rather double; inner edge continuous, slightly ex- 
panded; outer edge angularly dilated above, with the right 
margin scarcely spreading, columellar and left margin wanting. 
Operculum? Length 16, breadth 7 mill. 
Cyclostoma turritum, Pfr. in Proc. Zool. Soc. 1851; Le. n. 313, 
t. 41, f. 1, 2 
Chondropoma? turritum, Pfr. Con. n. 425, p. 69; Pnewm. Mon. 
Pp. 289. 
Hab. Honduras (Dyson). 
20. CHONDROPOMA CRENULATUM. 
Shell narrowly perforate, oblong-turreted, truncate, rather solid, 
sculptured with raised spiral ridges, and minute sharp longitu- 
dinal ribs traversing the ridges, cinnamon-coloured ; suture fur- 
nished with somewhat distant white crenulations ; whorls re- 
maining 4, convex; aperture perpendicular, ovate; peristome 
reddish, continuous, rather doubled; inner edge slightly ex- 
panded, appressed; outer edge slightly spreading, somewhat in- 
terrupted on the penultimate whorl. Operculum typical. Length 
11, breadth 5 mill. 
Cyclostoma crenulatum, Fer. Mus.; Pot. & Mich. Gal. i. p. 235, 
— $.24,£.3,4; Petit, Journ. Conch. 1850, 1. p. 47. 
Cyclostoma Guadeloupense, Pfr. Jc. n. 193, p. 176, t. 28, f. 9-11. 
Chondropoma Guadeloupense, Pfr. in Z. f. Mf, 1847, p. 124. 
Chondropoma crenulatum, Pfr. Consp.n.426; Pneum. Mon. p. 289. 
Hab, Island of Guadeloupe. 
21. CHoNDROPOMA ? DIAPHANUM. 
Shell subperforate, oblong-turreted, truncate, rather thin, decus- 
sated with crowded spiral ridges and more crowded thread-like 
ribs traversing the ridges, diaphanous, uniformly whitish; 
spire elongate; suture crenate irregularly; whorls remaining 
4+, convex, rather equal, last detached anteriorly, keeled above, 
rounded and more distinctly spirally grooved beneath; aperture 
perpendicular, angularly ovate; peristome rather simple, con- 
tinuous, slightly expanded all round. Operculum? Length 12, 
breadth 5 mill. 
T 
