Ads CRETACEOUS GASTROPODA 
An obtuse and slight keel is usually traceable about the middle of the last whorl ; 
if however the casts are not well preserved, the convexity appears to be almost quite 
uniform. The aperture is oval, oblique and anteriorly distinctly notched. The 
outer lip slightly expanded, internally provided with a thick fold-lke varix. The 
position of the varices on the upper whorls is very variable. Sometimes they are 
nearly opposite, and as the entire shell is usually somewhat depressed from front to 
back, its general shape recalls very much some of the smooth Ranelle, or a Scarabeus, 
neglecting of course the external varices or laminze. — In other specimens the impres- 
sions are somewhat more distant than half of a circuit, as may be seen by a compari- 
son of Fig. 8a, Pl. V. On the uppermost whorls, or respectively in young speci- 
mens, the varices do not seem to have become developed at all, and very often, when 
present, their number and the position are scarcely in two specimens exactly the same 
and corresponding. The inner lip is callose, leaving a sort of fissure in the columella. 
T had already occasion to mention (vide p. 41.), that this species agrees far more 
with one described by Drescher from Germany than with the true Pt. inflata, D’Orb., 
with which it has merely the general form in common. 
The species is a very characteristic fossil of the Ootatoor group and compar- 
atively not very rare. It occurs usually in casts which show several variations in 
the height of the spire and the proportions of the last whorl. | 
Localities. Neighbourhood of Ootatoor, Odium, Moraviatoor, Monglepaudy, 
Coonum and Puravoy, in limestones or calcareous sandstones. 
Formation. Ootatoor group. 
Il. Fumily—OCYPRAID 4. 
The genera Oyprea and Ovula, as fixed by Lamarck, are the typical forms of 
this family. In general the shells are ventricose, globose, or elliptical : the last whorl 
embracing totally or to a great extent the former; polished, being covered by an 
enamel coating ; anteriorly and posteriorly produced into a short canal, notched and 
effuse on both ends or at least at the anterior extremity. The aperture is narrow, 
linear, extending over the entire length on the ventral side of the shell, with an 
inflexed outer lip, 
There exists a good deal of difference in opinion as to the genera which ought 
to be admitted into this family. Usually only the two genera mentioned above, 
Cyprea and Ovula, have been quoted, according to Lamarck. rato was for some 
time not accepted at all, but afterwards was by many conchologists united with this 
family, as well as the singular genus Pedicularia. Marginella is by some authors 
described next to Cyprea, while others refer it, apparently more correctly, to the 
neighbourhood of Voluta. Deshayes is strongly opposed to this classification and 
retains MJarginella in the Orpramrpa (An. s. vert. bas. Paris, 2d. edit. ITI, 543). 
HH. and A. Adams (Genera, I, p. 263, ete.) have established three families, CrrrapZ, 
Auruprrasip# and Pepricvraris. There are no doubt several distinctions between 
Cyprea and Ovula (Amphiperas),—but apparently not equal to those in other 
