138 CATALOGUE OF PHANEROPNEUMONA. 
B. Younger shell: Lisalh 
Cyclostoma pulchellum, Sow. Thes. t. 31, f. 263, 264; Pfr. Ic. t. 18, 
ha, B. 
Tropidophora pulchella, Pfr. in Z. f. If. 1847, p. 106, n. 11. 
Locality unknown. 
12. CycLosTOMUS ZONULATUS. 
Shell globose-pyramidal, rather thin, sculptured with crowded 
longitudinal striz and with numerous sharp keels, ash-gray ; 
spire conical, rather pointed; whorls 5, convex, the last one 
with a single sharp peripherical keel, with spiral ridges and three 
rather raised keels above, closely spirally grooved and painted 
with several brownish-horn-coloured bands beneath; aperture 
nearly perpendicular, rather circular; peristome white, shortly 
interrupted, with the right margin dilated, rectangularly ex- 
panded, scolloped, left margin narrow, reflexed above into a 
vaulted lamina, which nearly closes the narrow umbilicus. 
Height 19, greatest breadth 21, least br. 16 mill. 
Cyclostoma zonulatum, Ferussac, Mus.; Sow. Thes. Suppl. n. 180, 
p. 159%, t. 31, A. f. 296, 297; Pfr. Ic. n. 238, t. 34, £17, 18. 
Cyclostomus zonulatus, Pfr. Consp. n. 286; Pneum. Mon. p. 196. ° 
Locality unknown. 
13. CycLosTOMUS TRICARINATUS. B. M. 
Shell top-shaped, acuminate, pale with indistinct yellow transverse 
stripes and spiral striz; whorls 5, marked with very numerous 
convex spiral ridges and three stronger raised sharp keels; 
aperture dilated, nearly circular; peristome dilated, white, with 
sharp margins, left margin produced, not altogether covering 
the perforated axis. Breadth 11 lin. 
Helix tricarinata, Miller, Hist. Verm. ii. p. 84, n. 282; Chemn. 
Conch. Cab. ix. P. II. p. 85, t. 126, f. 1103, 1104; Gmel. Syst. 
p- 3621, n. 34. 
Turbo carinatus, Wood, Jnd. t. 32, f. 125. 
Cyclostoma tricarinata, Lam. /Tist. vi. p. 144, n. 6. Ed. Désh. viii. 
. 300. 
Fe icctoana tricarinatum, Pfr. Ic. t. 4, f. 16, 17 (excluding the 
description, and t. 3, f. 8). 
Tropidophora tricarinata, Pfr. in Z. f. MM. 1847, p. 106, n. 12; 
Gray, Cat. Cycl. p. 39, n. 5 (excluding the varieties). 
Cyclostomus tricarinatus, Pfr. Consp. n. 287; Pnewm. Mon. p. 197. 
Hab. Madagascar. 
14, CycLosToMUS CARINATUS. B. M. 
Shell globose-conical, coarsely sculptured on the whole surface, 
with rather crowded spiral ridges, pale fulvous ; spire conoidal, 
