CYCLOPHORIDA. 109 
elegantly furnished with small white teeth; whorls remaining 
3, convex, last rounded; aperture rather perpendicular, nearly 
circular, lead-coloured inside; peristome thickened, continuous, 
shortly affixed, angularly ascending above, with the right mar- 
gin receding and sinuate above, produced forward below the 
middle; columellar margin dilated, expanded. Operculum 
internally cartilaginous, horn-coloured. Length 26, breadth 
15 mill. 
Cyclostoma majusculum, Morelet, Test. Noviss. ii. p. 19, n. 129; 
Poey, Mem. ii. pp. 96, 105. 
Cyclostoma mactum, Poey, Memor. Hist. Nat. Cuba, i. t. 8, f. 6-12; 
Pfr. Ic. 0.251, t. 36, f..1, 2. 
Choanopoma majusculum, Pfr. Consp. n. 223, p. 59. 
Choanopoma mactum, Pfr. Pneum. Mon. pp. 154, 417. 
Hab. Cuba. 
2. CHOANOPOMA DECUSSATUM. 
Shell subperforate, ovate-conical, slightly truncate, rather decus- 
sated by obtusely-raised spiral lines and crowded longitudinal 
stria, somewhat shining, yellowish-brown, elegantly painted 
with angulated reddish-brown longitudinal lines; spire regularly 
tapering; suture irregularly crenulate; whorls remaining 5, 
moderately convex, the last ventricose, slightly detached ante- 
riorly, brownish-violaceous beneath; aperture perpendicular, 
rather ovate; peristome double, white; inner edge scarcely 
prominent ; outer edge angularly expanded, produced above into 
an angle. QOperculum typical. Length 143, breadth 63 mill. 
Cyclostoma decussata, Lam. Hist. vi. p. 147, n. 118; Ed. Desh. 
p. 358; Delessert, Recueil, t. 29, £.6; Chenu, lll. Conch. t. 1, f. 6. 
Cyclostoma decussatum, Pfr. Jc. n. 197, p. 178, t. 29, f. 10-13 
(from Deless.), t. 38, f. 38, 39. 
Cistula? decussata, Gray, Cat. Cycl. p. 58, n. 6. 
Choanopoma decussatum, Pfr. Consp. n. 224; Pneum. Mon. p. 155. 
Hab. Porto Rico. 
3. CHOANOPOMA GRANOSUM. 
Shell perforate, turreted-oblong, rather thin, granularly decus- 
sated by rounded linear ridges and smaller more closely-set 
raised longitudinal lines, not shining, slightly diaphanous, pale 
horn-coloured, clouded with reddish-brown, forming, principally 
on the last whorl, broad spots and streaks; spire elongate, 
scarcely curvilinear, broadly truncate; suture deep, crenulate 
irregularly and obsoletely; whorls remaining 4, convex, the 
last scarcely larger than the preceding; aperture perpendicular, 
ovate-roundish ; peristome yellowish, double; inner edge short, 
L 
