CYCLOPHORIDA. 135 
Tropidophora articulata et Terveriana, Gray, Cat. Cyel. p. 38, 42. 
Cyclostomus articulatus, Pfr. Consp. n. 278; Pneum. Mon. p. 191. 
Hab. Kast India (Sowerby), Madagascar (Grateloup), Island of 
Rodriguez, near Mauritius (Benson). 
5. Cycnostomus DESHAYESIANUS. 
Shell depressed, solid, sculptured above with numerous, alter- 
nately sharply raised keels, with the interstices very minutely 
decussated, opaque, reddish-orange-coloured ; spire shortly tur- 
binate, with the apex rather nipple-shaped; whorls 5, convex, 
enlarging rapidly, the last one descending, with a sharper com- 
pressed peripherical keel, convex beneath and closely spirally 
striate; umbilicus middle-sized; aperture very oblique, rather 
circular; peristome indistinctly double; inner edge callous, 
blunt, white; outer edge thickened, expanded angularly, pro- 
duced forward and dilated above, affixed. Height 11, greatest 
breadth 22, least br. 19 mill. 
Cyclostoma Deshayesianum, Petit, in Rev. Zool. 1843, p. 3; Mag. 
Zool. 1844, t. 98; Pfr. Ic. n. 192, p. 175, t. 25, f.8-10; Sow. Thes. 
Suppl. n. 191, p. 164%, t. 31 B, f. 326, 327, 
Cyclostoma gratum, Meruss. Mus. 
Tropidophora Deshayesiana, Pfr. in Z. f. Mf. 1847, p. 106, n. 6, 
Tropidophora Cuvieriana var., Gray, Cat. Cycl. p. 38. 
Cyclostomus Deshayesianus, Pfr. Consp. n. 279; Pneum. Mon, 
p. 192. 
Hab. The Northern part of Madagascar. 
6. Cycnostomus ABEILLEI. 
Shell orbiculate, rather trochiform, umbilicate, five-keeled, trans- 
versely furrowed, whitish, with dark bands or yellowish spots; 
umbilicus deep; spire short, pointed; whorls 5; aperture rather 
circular; lips sharp, slightly reflexed. Height 16-17, breadth 
20 mill. 
Cyclostoma Abeillei, Grateloup, in Act. Soc. Lin. Bord. xi. p. 437, 
t. 3, f. 6. 
Tropidophora Abeillei, Pfr. in Z. f. M. 1847, p. 106, n. 3; Gray, 
Cat. Cyel. p. 42, n. 19. 
Cyclostomus Abeillei, Pfr. Consp. n. 280; Pneum. Mon. p. 193. 
Hab. Madagascar. 
7. CYCLOSTOMUS MODESTUS. 
Shell depressed, rather solid, slightly striate, with numerous spiral 
ridges and three sharper keels, brownish-white; spire flat; 
whorls 4, depressed, united by a channelled suture, the last 
convex beneath; umbilicus wide; aperture oblique, angularly 
ovate; peristome white, with the margins approximate, joined 
