CYCLOPHORIDA. 197 
$ 1. Peristome simple, thin, broadly expanded. 
1. CHONDROPOMA MAGNIFICUM. 
Shell perforate, ovate-conic, thin, sculptured with longitudinal 
fold-like striz, diaphanous, little shining, uniformly alabaster- 
white, or whitish, painted with variously-interrupted chestnut- 
coloured bands, of which the middle one is broader, composed 
of narrow angulated streaks; spire ventricose, with the apex 
subtruncate; suture simple; whorls remaining 5, moderately 
convex, last rounded ; aperture perpendicular, ovate; peristome 
simple, shining, white, with chestnut-coloured spots, dilated 
above inito the shape of a cap, shortly affixed to the penultimate 
whorl and narrower on that side, sinuate near the perforation 
and dilated into a spreading tongue below it; right and basal 
margin broadly reflexed and vaulted. Operculum typical. 
Length 29, breadth 15 mill. 
Cyclostoma magnificum, Sallé MSS.; Pfr. in Proc. Zool. Soc. 1852 ; 
Ic. n. 389, t. 47, f. 20-22. 
Chondropoma magnificum, Pfr. Pnewm. Mon. p. 278. 
Hab. Haiti (Sallé). 
§ 2. Peristome simple, thin, shortly or scarcely expanded. 
2. CHONDROPOMA PLICATULUM. 
Shell subperforate, oblong-turreted, not or only shortly truncate, 
thin, sculptured with crowded slight longitudinal plaits, diapha- 
nous, horn-coloured-whitish, painted with rather broad chestnut- 
coloured bands, which are articulated or interrupted by streaks ; 
whorls 7%, convex, increasing regularly, last shortly detached 
anteriorly, rounded, spirally grooved round the obsolete per- 
foration ; aperture perpendicular, obliquely elliptical; peristome 
simple, scarcely spreading, angulated above. Operculum typical, 
brownish. Length 20, breadth 92 mill. 
Cyclostoma plicatulum, Pfr. in Z. f. MM. 1846, p. 48; Je. n. 77, 
p. 82, t. 10, f. 14, 15, t. 28, f. 12, 13. 
Chondropoma plicatulum, Pfr. in Z. f. Mf. 1847, p. 109, 0.3; Gray, 
Cat. Cycl. p. 56, n. 3; Pfr. Consp. n. 413; Pneum. Mon. p. 279. 
8. Smaller, with the articulated bands narrow; length 162, breadth 
8 mill. 
Hab. Puerto Cabello, Venezuela. 
3. CHONDROPOMA SALLEANUM. 
Shell subpertforate, turreted-oblong, scarcely truncate, thin, trel- 
lised regularly by crowded raised strive, not shining, fuscous- 
whitish, painted with chestnut-coloured spots, arranged in 
8 2 
