^0 



CYPRINA Moirisii. 



TAB. DCXX. 



Spec. Char. Transversely oval or oblong-, regu- 

 larly convex, rather compressed ; beaks pro- 

 minent; anterior slope sharp-edged, the pos- 

 terior slope rounded ; lunette sunk, undefined; 

 principal hinge-tooth in the right valve broad. 



Syn. Venus incrassata, Wetherell, Foss. of the 

 London Clay, ^c , Phil. Mag. and Journ. 

 V. ix. 463. V. Morrisii, ih. v x. 239. 



A SMOOTH thin shell of variable proportions, generally 

 oval; the depth of the undefined lunette gives a charac- 

 ter to its form, which when once noticed is easily recog- 

 nized. It occurs in the lower beds of the London Clay, 

 sometimes called Plastic Clay, either in sand, as at Re- 

 culvers, Heme Bay and Pegwell Bay, on the coast of 

 Rent, and at Plumstead, Watford and Reading ; or in 

 indurated sandy marl, as at Bognor, and near the bottom 

 of the well on Hampstead Heath. 



When I made the alteration in Mr. Wetherell's list, 

 quoted above, which Mr. Morris suggested, the hinge 

 was still unknown, and consequently I referred the shell 

 to the wrong genus; a number of specimens from the 

 sandy beds and from the Hampstead Well have been 

 since worked out, so as to enable me to correct this error. 



Figs. 1 — 4. represent specimens from Heme Bay, 

 some of which are in Mr. Bowerbank's cabinet ; fig. 5, 

 a variety from Pegwell Bay ; tig. 6, a small variety from 

 Boughton, near Canterbury: it is a cast in Calcedony ; 

 many such were found, and some of them contained 

 water. 



