PULMONATA. 129 
specimens in my own collection, enables me to show that the Ovulum retusum is, as I 
have stated, only the young shell of the present species. The shells represented by 
fig. le, 1f, and 12, are young Cypree, in the first stage of growth, without teeth on 
either lip, and before the outer lip has become involute, but presenting the transverse 
lineation of the so-called Ovulum retusum, fig. 12, being, in fact, taken from one of the 
original specimens so described. In the next specimen, fig. ly, the shell has apparently 
attained the second or intermediate stage, the columellar teeth having been formed, 
and the lateral expansion of the left lip having commenced; and we find these 
characters associated with the transverse lineation. The specimen, fig. 14, is a fully 
formed shell of C@. oviformis, in which, a portion of the shell having been broken away, 
the interior volutions, exhibiting the transverse lineation, are disclosed. 
Size.—Axis, 1 inch and 3-10ths; diameter, 1 inch. 
Localities.—Primrose Hill, Highgate, Hampstead, Haverstock Hill, Copenhagen 
Fields ; Barnet, Whetstone, Potter’s Bar, Sheppey. 
No. 72. Cypr@a BowERBankil. Sowerby. Tab. XVII, fig. la—d. 
Cypr@a ovirormts, Sow. (1812.) Min. Con., vol. i, p. 17; t. 4, upper fig. 
—  Bownreanxu, Sow. (1850.) Dixon’s Geol. &c., Suss., pp. 108 and 189, t. 8, 
figs. 1 and 2. 
C. testa oviformi, ventricosd, levi: apertura angustd, arcuatd, anticé sub-effusd, late 
emarginata ; labro inflexo, marginato, postice producto, antice compresso, dentato-plicato, 
dentibus anterioribus elongatis ; columella dentata, dentibus anticis pliciformibus ; denti 
prima magnd, proeminenti, rotundald, 
Shell egg-shaped, ventricose, smooth: aperture curved, narrow, effuse in front, 
without a posterior canal, and widely but not deeply notched at the base; outer lip 
incurved, produced posteriorly, flattened towards the front; teeth on the flat part 
elongated, oblique; the anterior tooth on the columella large, round, prominent, and 
very oblique. 
The specimen represented by fig. 1a and 14, and for the use of which I am indebted 
to Mr. Sowerby, is the Highgate shell, from which the upper figure in tab. 4 of 
‘Mineral Conchology,’ was taken; it has not attained maturity, the teeth not being 
formed on the outer lip. It will be seen that the aperture in fig. 14 is wider in front 
than that in fig. 1¢, which is taken from a fully grown shell: this difference is to be 
attributed partly to the immature state of the outer lip of the specimen, and partly to 
the front of the columella being represented with a curve too deep. In other respects 
the Highgate shell agrees with those from Bracklesham Bay. The figs. le and 1d, 
are taken from specimens which form part of the late Mr. Dixon’s collection. 
Mi 
