CYCLOPHORID A, 9 
@ 
perforation; aperture nearly perpendicular, circular; peristome 
much thickened, dilated, widely affixed to the penult whorl, 
with the left margin subauriculate, sometimes perfectly closing 
the umbilical cleft. Length 27, breadth 12 mill. 
Turbo tortus, Wood, Ind. Suppl. t. 6, f. 32. 
Cyclostoma tortum, Gray, in Wood, Suppl. p. 36; Sow. Thes. n. 169, 
p. 151, t. 28, f. 1822; Pfr. Ie. n. 115, p. 113, 6. 17, f. 22-23. 
Cyclostoma torta, Desh.in Lam. Hist. viii. p. 372, n. 42; Orb. Moll. 
Cub. i. p. 257; Chenu, Ill. Conch. t. 1, f. 16. 
Megalomastoma tortum, Pfr. in Z. f. M. 1847, p. 109, n. 7; Consp. 
n. 185; Pneum. Mon. p. 126. 
Farcimen tortum, Gray, Cat. Cycl. p. 29, n. 4 (in part). 
Hab. Cuba. 
8. MEGALOMASTOMA BITUBERCULATUM. 
Shell perforate, oblong-pupa-shaped, shortly truncate, solid, irre- 
gularly and coarsely striate, little shining, grayish-flesh-coloured ; 
spire rather turreted; suture deep; whorls 5, very convex, the 
last descending, slightly detached anteriorly, a little compressed 
near the perforation; aperture nearly perpendicular, with the 
base somewhat produced beyond the axis, circular, chestnut- 
coloured inside; peristome much thickened, reflected, with the 
external edge cut out on the penult whorl, and terminating on 
both sides into a rounded knot. Length 34, breadth 15 mill. 
Cyclostoma bituberculatum, Sow. Thes. Suppl. n. 192, p. 164%, t. 31, 
A. £, 290, 291; Pfr. Ic. n. 253, t. 36, f. 5, 6. 
Megalomastoma bituberculatum, Pfr. Consp. n. 186; Pneuwm. Mon. 
p. 127. 
8. Smaller, more ovate, subtruncate, dark violaceous, fulvous to- 
wards the apex, with the peristome auriculated on both sides; 
length 24, breadth 114 mill. 
Cyclostoma auriculatum, Sow. Thes. n. 171, p. 151, t. 31, f. 277; 
Ee yeetern, 113) p. 142, t.17, f.. 16, 17. 
y. Shell like var. 8, with the peristome obliquely cut off along the 
penultimate whorl, sometimes slightly channelled. 
Cyclostoma auriculatum var., Pfr. Zc. t. 17, f. 12, 13. 
Cyclostoma solenatum, Poey, Memorias sobre la Hist. Nat. de Cuba, 
4, te Py te Logic 
Cyclostoma tortum var., Poey, Mem. ii. p. 105, t. 18, f. 25, 26. 
Hab. Cuba. 
6. MEeGALOMASTOMA MANnTt. 
Shell perforate, oblong, pupa-shaped, solid, marked with irregular 
slight arcuate striz, little shining, uniformly greenish-fulvid, or 
with the two last whorls greenish-violaceous; spire inflated, 
BQ 
