CYCLOSTOMA.—Ptate IV. 
tis, juata suturas planulatis et obsolete canaliculatis, 
deinde rotundatis, undique spiraliter elevato-striatis ; 
aperturd obliqué circulari, intus purpurascente, labro 
vie refleco, marginibus postice calloso-ascendentibus. 
Mou.ins’ Cyctostoma. Shell rather largely umbili- 
cated, depressed, whitish, stained and spirally l- 
neated and banded with rust-purple; whorls rather 
narrow, flat and obsoletely channelled next the su- 
ture, then rounded, everywhere spirally elevately 
striated; aperture obliquely circular, purplish within, 
lip searcely reflected, margins callously ascending 
posteriorly. 
GrateLoup, Act. Soc. Linn. Bordeaux, vol. ii. p. 444. 
pl. 3. f. 19. 
Cyclostoma Desmoulinsii, Sowerby. 
| Hab. Madagascar. 
Of a rather less discoid form than the preceding, though 
much depressed, while the umbilicus is not so largely 
open. 
