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. \e, \f, and \i, are young Cyprseae, 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. \i, being, in fact, taken from one of the 

 original specimens so described. In the next specimen, fig. \g, 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. \h, 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,ea Bowerbankii. Sowerby. Tab. XVII, fig. la—d. 



CypRjEA oviformis, Sow. (1812.) Min. Con., vol. i, p. 17 ; t. 4, upper fig. 



— Bowerbankii, Sow. (1850.) Dixon's Geol. &c, Suss., pp. 108 and 189, t. 8, 

 figs. 1 and 2. 



C. testa oviformi, ventricosd, lesvi : aperturd angustd, arcuatd, antice sub-effusd, late 

 emarginatd ; labro inflexo, marginato, postice producto, antice compresso, dentato-plicato, 

 dentibus anterioribus elongatis ; columella dentatd, dentibus anticis pliciformibus ; denti 

 prima magna, 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. \a and \b, 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. lb is wider in front 

 than that in fig. Id, 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. \c and Id, 

 are taken from specimens which form part of the late Mr. Dixon's collection. 



•17 



