CYCLOPHORIDE. 91 
9, MEGALOMASTOMA AURICULATUM. B. M. 
Shell perforate, ovate-conic, solid, with slightly arcuate striz, 
whitish above, dark violaceous below the middle, covered with a 
greenish-fulvid periostraca; spire convexly turreted, with the 
apex not truncate, rather pointed; whorls 7, convex, the lower 
ones descending somewhat irregularly, the last one less convex, 
slightly compressed round the perforation; aperture perpen- 
dicular, circular, brownish-violaceous internally ; peristome con- 
tinuous, with the margin shortly touching the penult whorl 
simple, otherwise thickened and reflected; columellar margin 
dilated, subauriculate. Length 22, breadth 11 mill. 
Cyclostoma auriculata, Orb. Moll. Cub. i. p. 257, t. 22, f. 1, 2; 
Desh. Traité Elém. Conch. t. 82, f. 11. 
Cyclostoma bicolor, Gould, in Proc. Bost. Soc. 1843, p. 138. 
Cyclostoma auriculatum, Gould, in Bost. Jowrn. iv. 4, p. 494; Pfr. 
de. Gib, f 14, 15. : 
Cyclostoma idolum, Feruss. Mus. 
Cyclostoma tortum var., Sow. Thes. t. 28, f. 181? 
Megalomastoma auriculatum, Pfr. in Z. f. M. 1847, p. 109, n. 8; 
Consp. n. 187; Pnewm. Mon. p. 129. 
Farcimen tortum var., Gray, Cat. Cycl. p. 29. 
8. A little smaller, with the peristome less thickened. 
Cyclostoma apertum, Poey, Mem. Hist. Nat. Cuba, i. t. 7, f. 15, 16. 
Cyclostoma tortum var., Poey, Mem. ii. p. 105, t. 13, f. 29, 30. 
Hab. Cuba. 
10. MegaLoMASTOMA ORBIGNYI. 
Shell subperforate, elongate, pupa-shaped, solid, closely and arcu- 
ately striate, reddish-fulvid; spire rather cylindrical, tapering 
gradually, with the apex conical; suture deep; whorls 8, 
scarcely convex, the penultimate very broad, the last marked 
with a broad violaceous band, which becomes indistinct ante- 
riorly, furnished beneath with a blunt, compressed crest; aper- 
ture perpendicular, circular; peristome thickened, slightly re- 
flected, affixed above, submarginate below the crest of the 
penult whorls. Operculum whitish. Length 27, breadth 9 mill. 
Cyclostoma Orbignyi, Pfr. in Proc. Z. S. 1850; Ic. n. 262, t. 37, 
f. 3, 4. 
Megalomastoma Orbignyi, Pfr. Consp. n. 190, p. 73; Pnewm. Mon. 
p. 130. 
8. Uniformly greenish-fulvid. 
. Smaller, with more convex whorls, sometimes quite violaceous ; 
length 20, breadth 8 mill. (Pfr. Lc. t. 37, f. 5, 6.) 
Hab, Haiti (M. Salle). 
