GASTEROPODA. 15 
exhibit this feature, even if it originally existed; the plications of growth are also very 
large, so that in the latter volutions they render the carine distinctly nodulous ; in 
C. vittata the carine are but slightly modified by this cause. 
D’Orbigny, ‘Prodrome,’ has suggested that Merinea suprajurensis, D’Archiac, may 
be C. vittata ; but, judging from the figure of D’Archiac, WV. swprajurensis is more slender, 
with the volutions much more numerous and more narrow, the sutures are also desti- 
tute of that deeply indented figure which is so conspicuous in our Cornbrash shell. 
The general resemblance which C. vittata bears to some examples of the genus Nerinza 
has led me to make a longitudinal section of it, and thus to ascertain with certainty that 
it cannot be assigned to that genus, 
Geological Position and Locality. ‘The Cornbrash of Scarborough and Gristhorp ; it is 
not rare, but is very difficult to disengage from the hard limestone, 
Kinvertia, Gen. Nov. 
The views expressed on Cerithium strangulatum, p. 8, suggesting the propriety of 
erecting a new genus for the reception of that and other allied forms, have subsequently 
been strengthened by the examination of well-preserved specimens from the Forest 
Marble of Somerset and Wilts, in the collection of W. Walton, Esq., of Bath. I have 
now, therefore, no hesitation m proposing for these the new generic appellation Kilvertia, 
which will be found described in the Addenda. 
Kinvertia constricra, Lyc. Tab. XLIV, fig. 8. 
Testa parva turrita, elongata, anfractibus (8) superne planalis, inferne ventricosis, suturis 
bene distinctis, lineis transversalibus et longitudinalibus, delicatissimis, cancellatis ; apertura 
suborbiculart depressa, incrassato. 
The height of each volution is about equal to half its opposite measurement, the first 
encircling line beneath the suture is rather more prominent than the others; altogether 
there are six; their size and distances correspond nearly with the lines by which they are 
decussated ; the aperture is imperfect at the outer lip, there is no umbilical chink. 
Geological Position and Locality. A minute univalve, obtained by crushing shelly 
portions of the Great Oolite of Minchinhampton Common; Mr. Witchell has also kindly 
forwarded a specimen obtained by him at the same locality, and in the same manner, 
