CYCLOPHORID. ip by 
§ 4. Shell depressed. 
18. CHOANOPOMA ? ALATUM. 
Shell conoidally depressed, rather solid, slightly sculptured with 
unequal crowded oblique ribs, scarcely diaphanous, whitish, 
painted with narrow, very pale horn-coloured bands; spire very 
shortly conoidal, rather pointed; suture simple; whorls 4, 
moderately convex, the last one nearly cylindrical, scarcely 
descending, and clouded with violaceous spots anteriorly ; um- 
bilicus wide, open; aperture diagonal, rather circular, lilaceous- 
brownish inside; peristome rather double, with the outer and 
inner edge joined and expanded on the right and basal margin; 
outer edge dilated above into a wing, and slightly reflected on 
the left side. Operculum ? Height 8, greatest breadth 
16, least br. 13 mill. 
Cyclostoma alatum, Pfr. in Proc. Z. 8. 1851; Ic. n. 326, t. 41, 
f. 35-37. 
Choanopoma? alatum, Pfr. Consp. n. 240, p. 60; Pneum. Mon. 
p. 166. , 
flab. San Yago de Cuba. 
19. CHOANOPOMA ? SOLUTUM. 
Shell depressed, closely sculptured with thread-like longitudinal 
ribs, silk-shining, diaphanous, whitish, with interrupted reddish- 
brown spiral lines; spire slightly raised, mucronate; suture 
slightly channelled and obsoletely denticulate ; whorls 5, con- 
vex, the last cylindrical, Gescending and detached anteriorly, 
spirally furrowed in the very broad umbilicus; aperture oblique, 
nearly circular; peristome double; inner edge continuous, 
straight, prominent ; outer edge white, expanded all round in 
a right angle, dilated above, inflexed and joined to the penulti- 
mate whorl. Height 55, greatest breadth 13, least br. 10 mill. 
Cyclostoma solutum, Lich. in Mus. Cuming; Pfr. Ic. n. 298, t. 39, 
f. 8-10. 
Choanopoma? solutum, Pfr. Consp. n. 241, p. 60; Pnewm. Mon. 
p. 167. 
Hab. Haiti. 
20. CHoANoPpomA ADOLFI. 
Shell conoidally semiglobose, rather thin, regularly granulate and 
decussated by radiating and spiral raised lines, diaphanous, 
fulvous, girdled with interrupted reddish-brown lines; spire 
convexly conoidal, mucronulate ; suture fringed with irregular 
and distant knots; whorls 44, convex, last rounded, furnished 
with several keel-like ridges, which surround the middle- 
sized umbilicus ; aperture rather oblique, circular; peristome 
