CYCLOPHORIDA, 19 
Cyclostoma diatretum, Gould, in Proc. Bost. Soc. 1847, p. 205 ; 
Exped. shells, p. 38, ed. 1851, p. 105, f. 124. 
Cyclotus? diatretus, Pfr. Consp. n. 29; Pnewm. Mon. p. 33. 
Hab, Feejee Islands, Sandalwood Bay. 
30. CycLOTUS GONOIDEUS. B.M. 
Shell globose-turbinate, thin, marmorated and banded with pale 
brownish and reddish-brown, girdled with raised spiral lines, 
and sometimes with one or two more distinct keels; spire conic, 
rather pointed; suture deep, somewhat crenate, or reddish- 
brown-spotted ; whorls 43, convex, the last one more distinctly 
furrowed around the umbilicus, which is somewhat funnel- 
shaped and of a middle size ; aperture nearly circular, of the 
same colour, and shining inside; peristome sharp, thin, a little 
expanded, with the margins nearly contiguous, joined into an 
angle by a short callus. Operculum of 5 whorls. Height 8, 
greatest breadth 103, least breadth 9 mill. (Pf) 
Cyclostoma spurcum, Sow. in Proc. Z. S. 1843, p. 60; Thes. n. 26, 
p- 99, t. 24, f. 75, 76. Not Grateloup. 
Cyclostoma conoideum, Pfr. in Z. f. If. 1846, p. 44; Jc. n. 99, 
p- 101, t. 13, f. 19-21. 
Cyclostoma varium, Barcl. MSS. ? 
Tropidophora conoidea, Pfr. in Z. f. Mf. 1847, p. 107. 
Cyclotus conoideus, Gray, Cat. Cycl. p. 10, n. 25; Pfr. Consp. n. 30; 
Pnreun. Mon. p. 33. - 
Hab. Seychelles Islands (Sowerby) ; South-America (Fitzroy, 
- Gray); Mauritius (Barclay). 
—_——— 
31. Crycitotus Merxicanvs. B. M. 
Shell depressed, nearly orbicular, rather solid, with crowded striz, 
opaque, flesh-coloured-whitish ; spire short, somewhat mucro- 
nate ; whorls 53, rounded, gradually increasing, the last one 
cylindrical, scarcely connected with the penult one ; umbilicus 
broad, open; aperture nearly perpendicular, circular, fulvous 
inside ; peristome continued, rather thickened and shortly ex- 
panded, with the left margin quite loose, deeply emarginate 
near the umbilicus, dilated and expanded below the notch. 
Operce.? Height 12, greatest breadth 24, least br. 19 mill. 
Cyclostoma Mexicanum, Menke, Synops. ed. ii. p. 133; Voigt, in 
Cuvier, Thierr. iii. p. 78; Philippi, Abild. i. 5, p. 104, t. 1, 
f.4; Sow. Thes. n. 64, p. 112, t. 25, £.93; Pfr. Ic. n. 49, p. 56, 
t. 7, f. 21, 22. 
