140 CATALOGUE OF PHANEROPNEUMONA. 
4, angulated, convex, the last one moderately convex above, 
and marked with several raised lines, more convex beneath, 
with rather crowded spiral ridges surrounding the umbilicus, 
which is middle-sized, funnel-shaped ; aperture oblique, ovate ; 
peristome simple, with the margins approximate, joined by thin 
callus ; right margin expanded, columellar margin reflexed. 
Height 17, greatest breadth 23, least br. 18 mill. 
Cyclostoma deliciosum, erussac, Mus.; Sow. Thes. Suppl. n. 186, 
p. 162*, t. 31, B. f. 314, 315; Pfr. Ic. n. 239, t. 34, f. 19, 20. 
Cyclostomus deliciosus, Pfr. Consp. n. 290; Pneum. Mon. p. 199. 
Hab. Madagascar. 
17. Cyctostomus MicHaupt. B. M. 
Shell globose-conical, solid, slightly striate, girdled with 7-8 more 
or less prominent, rather sharp keels, greyish or pale violaceous; 
spire conical, often truncate; whorls 6, convex, the last one 
separated by a very strong keel from the umbilicus, which is 
funnel-shaped, scarcely pervious, deeply spirally grooved within ; 
aperture rather circular ; peristome whitish, shortly expanded, 
crenulated, with the margins joined by a white callus, colu- 
mellar margin dilated, thickened, slightly reflexed, concealing 
the perforation, indistinctly channelled by the basal keel. 
Length 30, breadth 21 mill. 
Cyclostoma Michaudi, Grateloup, in Act. Soc. Linn. Bord. xi. p. 440, 
t.3,f.11; Pfr. Ic. n. 145, p. 138, t. 18, f. 14-16. 
Cyclostoma carinatum, Sow. Thes. n. 88, p. 119, t. 26, f. 117 (not 
f. 118). Not Born. 
Tropidophora Michaudi, Pfr. in Z. f. WM. 1847, p. 106, n. 13. 
Otopoma Michaudi, Gray, Cat. Cycl. p. 37, n. 10. 
Cyclostomus Michaudi, Pfr. Consp. n. 291; Pneum. Mon. p. 200. 
Hab, Madagascar (Grateloup). 
18. CycLtostomus BARcLAYANUS. 
Shell globose-conical, solid, slightly striate and furnished with 
numerous sharply-raised keels, violaceous-brownish, varied with 
darker and paler streaks; spire conical, with the apex blunt, 
often truncate ; whorls 5, little convex, the last one bearing 
three stronger, more prominent keels, the largest of which is on 
the periphery, the second on the base, the third on the upper 
side; aperture nearly perpendicular, rather circular, greyish- 
blood-red within; peristome blood-red, slightly thickened, ex- 
panded, lunarly emarginated on the penultimate whorl, with 
the right margin scolloped by the keels, columellar margin 
vaulted and reflected, almost covering the perforated axis. 
Length 29, breadth 23 mill. 
