154 CATALOGUE OF PHANEROPNEUMONA. 
Cyclostoma ligatula, Grateloup, in Act. Bord. xi. p. 445, t. 3, f. 20. 
Cyclostomus? ligatulus, Pfr. Consp. n. 321; Pnewm. Mon. p. 219. 
Hab. Madagascar (Mr. Duisabo). 
This may perhaps be identical with the preceding species. 
51. CycLtostomus ZANGUEBARICUS. 
Shell globose-conical, rather thin, sculptured with somewhat dis- 
tant blunt spiral lines, whitish or yellowish; spire turbinate, 
rather pointed; whorls 5, convex, last ventricose, girdled with 
several chestnut-coloured lines and a single broader band below 
the middle, spirally grooved beneath round the narrow umbi- 
licus; aperture nearly perpendicular, roundish, slightly angu- 
lated; peristome simple, scarcely interrupted on the penult 
whorl, very shortly expanded. Height 83, greatest breadth 10, 
least br. 9 mill. 
Cyclostoma Zanguebaricum, Petit, in Journ. Conch. 1850, i. p. 53, 
t.3,£.5; Pfr. Ic. n. 292, t. 39, £. 24, 25. 
Cyclostomus Zanguebaricus, Pfr. Consp. 322; Pnewm. Mon. p. 219. 
Hab, Zanzibar (Guillain). 
52. CycLOSTOMUS SUBLIRATUS. 
Shell globose-conical, thin, sculptured with spiral ridges, not 
shining, pale reddish-horn-coloured; spire raised, turbinate, 
with the apex rather blunt; whorls 5, convex, last rounded, with 
the ridges more obsolete; aperture somewhat oblique, oblong- 
roundish; peristome simple, thin, scarcely expanded, with the 
margins nearly contiguous, united by callus. Height 9, great- 
est breadth 10, least br. 8 mill. 
Cyclostoma subliratum, Pfr. in Proc. Z. 8.1851; Jc. n. 248, t. 43, 
ty 00, 38. 
Cyclostomus subliratus, Pfr. Consp. n. 323, p. 64; Pneum. Mon. 
p. 220. 
Locality unknown. 
53. Cycnostomus Nova# HIserni2. 
Shell turbinate-globose, thin, faintly striated, diaphanous, amber- 
coloured or reddish-brown; spire turbinate, acute; whorls 53, 
moderately convex, last large, rounded; aperture wide, rather 
perpendicular, nearly circular; peristome nearly continuous, 
thickened, shortly expanded, lunarly indented below the umbi- 
licus, which is extremely narrow, not pervious; left margin 
angularly dilated and expanded in the middle. Operculum 
calcareous. Height 9, greatest breadth 11, least br. 85 mill. 
