814 MANUAL OF THE MOLLUSCA. 
twisted, and directed slightly outwards. (B.) Shell oval, spire 
sunk, whorls with acute margins. Bath Oolite, Britain. 
Acteonina, D’Orbigny. Tornatelle ‘‘ without columella 
plaits,” 30 species. Carb.—Portlandian (including Cylindrites). 
Acteonella, D’Orbigny. A. Renauxiana, Pl. XIV., Fig. 3. 
Shell thick, cone-like or conyoluted, spire short or concealed, 
aperture long and narrow, columella with 3 strong and regular 
spiral plaits in front. Distribution, 18 species. Chalk; Britain, 
France. 
Acteon Cabanetiana, D’Orbigny. (Jtieria, Matheron, 1842), 
Coral-rag, France, belongs to the genus Nerinea (D’Orbigny), 
p. 244. 
CINULIA, Gray. 
Type, C. avellana, Pl. XIV., Fig. 4. 
Synonyms, Avellana and Ringinella, D’Orbigny. 
Shell globular, thick, spirally grooved and punctate, spire 
small; aperture narrow, rounded and sinuated in front; outer 
lip thickened and reflected; crenulated inside, columella with 
several tooth-like folds. 
Fossil, 21 species. Neocomian—Chalk. Britain, France. 
RINGICULA, y. p. 222, Pl. V., Fig. 21. 
GLopiconcHA, D’Orbigny. 
i ype, G. rotundata, D’Orbigny. 
Fossil, 6 species. Chalk. France. 
Shell ventricose, smooth, aperture crescent-shaped, simple, 
not toothed or thickened on the columellar side. 
VARIGERA, D’Orbigny. 1850.* 
Type, V. Guerangi, D’Orbigny. 
Fossil, 8 species. Neoc:—. Chalk. France. 
Shell like Globiconcha, but with lateral varices. 
TYLOSTOMA, Sharp. 1849. 
Type, T. Torrubis, Sharp. 
Etymology, Tulos, a callosity, stoma, mouth. 
Shell yventricose, smooth or punctate-striate, spire moderate, 
aperture ovyate-lunate, pointed above, rounded in front; outer 
lip periodically (once or twice in a whorl) thickened inside and 
expanded, rising slightly; inner lip callous, spread over body- 
whorl. 
Distribution, 4 species. lL. Cretaceous rocks, Portugal. 
* The dates of M. D’Orbigny’s genera, given in the Prodrome de Paleontology, are 
dates of invention; the names were not published, in many instances, until years 
efterwardg, 
