262 CRETACEOUS GASTROPODA 
4. Oremnobates, Blanford, 1863, (Ann. Mag. Nat. Hist., Vol. XII, p. 184). 
The typical species of this genus described by Blanford is Cr. Syhadrensis. The 
shell very much resembles those species of Zittorina which have a short spire 
and an inflated last volution. This species lives on the high cliffs near Bombay above 
the high water mark, and this may easily account for the very rudimentary state 
(or absence?) of the gills, which Mr. Blanford has not been able to detect. 
Troschel lately examined the teeth of this species, and found them identical with 
those of other Lirrorivipz.* Mr. W. Blanford has since obtained several other 
species of this genus, found under similar circumstances. All the species are 
distinguished by a remarkably thin, horny looking shell, as compared with 
Littorina. 
5. Stenotis, A. Adams, 1863, (Ann. Mag. Nat. Hist., XI, p- 351,) resembles 
Lacuna, but the inner margin of the aperture is detached from the shell. 
6. Lacumaria, (Conrad ; Smith. Mise. Coll., 1866, No. 200, Check list, eocene 
foss., p. 12). There are two species quoted, which were at first described under 
Natica; L. alabamiensis and L. erecta, Whitf. sp. 
I do not know that any species, belonging to the sub-family LacuNniv2, have up to the present 
time been noticed in cretaceous beds. 
ce. Sub-family,—LITTORININZ. 
Shell solid, conical or turbinate ; last whorl usually enlarged in conformable pro- 
portion with the previous ones; spire pointed, generally moderately elevated ; aperture 
roundish, entire in front ; immer lip flattened, smooth, not grooved ; centre of the basis 
occasionally impressed ; surface of shell spirally grooved, often tuberculated or even 
spinose, rarely smooth. 
There is only a small degree of difference between the characters of this and the 
previous sub-family, still it appears to be a convenient separation. The regularly 
spiral form of the shell, the ornamentation of the surface, and the smooth inner 
lip not being perceptibly enlarged, as well as the usual presence of a solid columella, 
are the most marked distinctions of the zzrrorryzva, in which the following genera 
may be placed :— 
1. <Amberleya, Morris et Lycett, 1850. (Paleeont. Society, London, Moll. 
Great Oolite, Univalves, p. 54;—Hucyclus, Kudes-Desl., 1860. Bull. Soc. Linn. 
Norm., Vol. V, p. 188). The authors of the ‘Mollusca of the Great Oolite’ proposed 
the name <Amberleya (Amberlya seems to be a misprint) for certain fossil species, 
which resemble in form and ornamentation Hamus (=Tectarws or Pagodus), but 
have a remarkably thin shell. The best known species is the jurassic Turbo capi- 
tameus, Minster ; it is, however, readily distinguished from any of the Trocurpx by 
the want of any internal pearly layer of the shell. Mr. Eudes-Deslongchamps not 
being acquainted with the above name proposed, some time after the publication 
of the name Amberleya, that of Hucyclus. He described at the same time several 
* The statement was communicated to me by the author himself. A notice of it is published, I think, 
inthe “Archiv fiir Naturgeschichte” for 1867, but I have not yet received the paper in Calcutta. 
