CYCLOPHORIDA. 145 
umbilicus ; aperture rather oblique, nearly circular, very shin- 
ing, purplish within; peristome simple, rufous, orange-coloured 
or white, bell-shaped, expanded, with the margins joined by a 
lunarly-indented callus, upper margin much dilated, columellar 
margin reflexed. Height 20, greatest breadth 34, least br. 27 mill. 
Cyclostoma unicarinata, Lam. Hist. vi. p. 144, n. 5; Hd. Desh. viii. 
p. 355; Eneycl. Méth. t. 461, f.1; Desh. in Ene. Méth. ii. p. 40, 
n. 4 
Cyclostoma fulvifrons, Sow. Spec. Conch. f. 122; Reeve, Conch. Syst. 
t. 185, f. 20. 
Cyclostoma unicarinatum, Sow. Thes. n. 84, p. 120, t. 26, f. 120; 
Pfr. Ic. n. 191, p. 174, t. 25, f. 7 (from Sowerby). 
Cyclophora unicarinata, Swains. Malac. p. 336. 
Tropidophora unicarinata, Pfr. in Z. f. AZ. 1847, p. 106, n. 4. 
Tropidophora tricarinata var., Gray, Cat. Cyel. p. 39. 
Cyclostomus unicarinatus, Pfr. Consp. n. 302; Pneuwm. Mon. p. 206. 
Hab. Madagascar. 
§ 4. Shell not keeled, depressed. 
29. Cychostomus? VITTATUS. B. M. 
Shell depressed, nearly discoidal, rather solid, marked with 
crowded oblique striz and with very numerous spiral lines, 
which are more indistinct on the middle of the last whorl, 
opaque, whitish, sometimes irregularly striped with yellow, 
painted with 8—14 unequal chestnut-coloured bands ; spire some- 
what raised, rather mucronate ; whorls 5, convex, the last one 
large, somewhat depressed ; umbilicus very broad and open; 
aperture slightly oblique, ovate, fulvid within with brown bands ; 
peristome whitish, shortly reflexed, with the margins almost 
contiguous, joined by a white, slightly-indented callus, right 
margin sinuate above. Height 19, greatest breadth 38, least 
br. 31 mill. 
Cyclostoma vittatum, Sow. Spec. Conch. f. 91-94; Reeve, Conch. 
Syst. t. 185, f. 122; Sow. Thes. n. 62, p. 112, t. 25, f. 89, 90 ; Pfr. 
Ic. n. 82, p. 87, t. 11, £. 5, 6. 
Cyclophorus ? vittatus, Pfr. in Z. f. M. 1847, p. 108, n. 26; Gray, 
Cat. Cyel. p. 21, n. 28; Pfr. Consp. n. 124. 
Cyclostomus? vittatus, Pfr. Pneum. Mon. p. 207. 
Hab, Madagascar. 
30. Cycntostomus? Mov.instt. B. M. 
Shell orbiculate, rather solid, crowdedly and slightly spirally 
grooved, fulvous-whitish, painted with numerous,'sometimes con- 
fluent, brown lines and one broader peripherical band, paler 
beneath ; spire very short, mucronate; whorls 5, convex, en- 
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