406 CRETACEOUS GASTROPODA . 
is a groove. When the specimens are, however, not fully grown or imperfectly 
preserved on the lip, their distinction from species of Acteon or Bullinula occasion- 
ally becomes extremely doubtful. 
16. Cinulia, Gray, 1840. Shell globose, spire short, surface spirally sulcated, 
aperture anteriorly produced, effuse, columella terminating with a single oblique 
and twisted fold. Meek (loc. cit., p. 92) properly, I think, suggests to retain this 
name for the type species, C. globulosa of Deshayes. The genus only differs from 
Acteon by the thickened outer lip. We have no Indian species of this type. 
17. Avellana, D’Orbigny, 1842.* Shell globose, inner lip with two or three 
folds, one being anterior, often bipartite, placed at the termination of the columella, 
the other sub-anterior separated from the former by a deep insinuation of the lip ; 
there is generally a third one placed about the middle of the inner lip, and one or 
two posterior, much shorter ones, but these are not constant. 
Avellana incrassata, d’Orb., may be considered as the type of this genus. We 
shall note four species from our cretaceous deposits. The Avellane are shells of 
moderate size and always have a more or less globular form. 
18. Ringinella, D’Orbigny, 1842. Shell ovate, with turreted spire, inner lip 
anteriorly with two or three oblique folds, of which the most anterior one is often 
bifid; anterior canal usually indistinct. There is no posterior fold present, but the 
lip sometimes forms in the middle a strong projecting angle. 
Ringinella Clementina, D’Orb., or Avell. Valdensis, Pictet, may be considered 
as the types of this genus. One new species ocewrs in our Sth. Indian eretaceous 
deposits. 
19. Ringicula, Deshayes, 1838. Shell ovate with pointed spire, inner lip 
anteriorly deeply indented, with two oblique folds only, in the middle often angular, 
anterior canal very distinct and deep. The species begin in the cretaceous period 
and continue up to the present time. We shall note two species from the 
cretaceous rocks of South India. 
20. Huptycha, Meek, 1863 (Americ. Journ., XXXV, p. 93). Shell globose, 
aperture very narrow, one strong, often bifid, anterior fold on the inner lip, which 
is in the middle flattened and projecting in the space of the aperture, being 
separated from the fold by a deep insinuation ; the outer lip is generally somewhat 
produced anteriorly, the anterior canal being distinct. The shells belonging to this 
genus generally are of larger size, than other rzzvercvzinz. The Auricula decur- 
tata, Sow., from the Alpine Gosau deposits is, as stated by Meek, a species of 
this genus, but Avellana Royana, d’Orb., does not belong to it. In fact I do not 
know any other species referrible to this genus, except three from our cretaceous 
deposits, being remarkable for their large size. 
21.? Stomatodon, Seeley, 1861 (Ann. mag. nat. hist., VII, p. 298), a name 
given to the cast of a shell from the Cambridge Greensand ; the species S¢. politus 
* The name Avellana on the plates 168 and 169 of the 2nd Volume of d’Orbigny’s Paléontologie francaise 
was published about the end of 1842, the text subsequently, I think, in the next year. (See Bronn’s Jahrbuch 
for 1842). 
