144 CATALOGUE OF PHANEROPNEUMONA. 
26. CycLostomus ? TROCHLEA. 
Shell narrowly umbilicated, pyramidally turreted, smooth, whitish ; 
apex rather blunt; suture impressed; whorls 5, angularly con- 
vex, with one keel on the upper side, last whorl furnished with 
three keels, one above, the second about the middle, and the 
third round the pervious umbilicus; aperture oblique, circular, 
forming two-sevenths of the total length; peristome sharp, 
scarcely angulated at the termination of the lower keel. Length 
3, breadth 2 mill. 
Cyclostoma trochlea, Benson, in Ann. and Mag. 1851, viii. p. 189 ; 
Pfr. Ie. n. 410, t. 49, f. 29, 30. 
Cyclostomus trochlea, Pfr. Consp. n. 300; Pneuwm. Mon. p. 205. 
/Iab. The Neilgherries Mountains (Jerdon). 
§ 3. Shell single keeled, turbinate-conical. 
27. Cyctostomus MApAGASCARIENSIS. B. M. 
Shell globose-turbinate, solid, rather smooth, sculptured with ob- 
solete raised lines, opaque, flesh-coloured, painted with unequal 
violaceous bands; spire turbinate, rather pointed; whorls 6, 
convex, increasing rapidly, the last one whitish above, marked 
with a single peripherical keel, convex beneath, grooved spirally 
within the umbilicus, which is wide, rather funnel-shaped ; 
aperture little oblique, nearly circular, shining and blackish 
within ; peristome simple, orange-red, with a pale edge, bell- 
shaped, expanded, arcuately emarginated on the penultimate 
whorl. Height 27, greatest breadth 39, least br. 31 mill. 
Cyclostoma Madagascariensis, Gray, in Griff. An. Kingd. t. 28, f. 4. 
Cyclostoma Duisabonis, Girateloup, in Act. Bord. xi. p. 435, t. 3, f.2. 
Cyclostoma obsoletum, var., Sow. Thes. t. 27, f. 125. 
Cyclostoma Madagascariense, Sow. Thes. Suppl. n. 177, p. 157%, 
t. 31, A. f. 289; Pfr. Ic. n. 287, t. 39, f. 1, 2. 
Cyclophora Madagascariensis, Swains. Malae. p. 336. 
Tropidophora tricarinata var., Gray, Cat. Cycl. p. 39, and Tr. 
Duisabonis, Gray, 1. ¢. p. 42, n. 17. 
Cyclostomus Madagascariensis, Pfr. Consp. n. 301; Pneum. Mon. 
p- 205. 
flab. Madagascar. 
28. CyYcLOSTOMUS UNICARINATUS. 
Shell depressed-turbinate, rather thin, faintly striate spirally, 
flesh-coloured, marbled with fuscous or banded with chestnut- 
colour ; spire conical, rather pointed ; whorls 53, convex, the 
last violaceous anteriorly, furnished, in the middle, with a 
-single compressed, sharp keel, crowdedly grooved round the 
