144 EOCENE MOLLUSCA. 
4. Carpita carinata, J. Sowerby. Tab. XXII, fig. 15, a, 6. 
VENERICARDIA Carinata, J. Sow. Min. Conch., t. 259, fig. 2, 1820. 
Spec. Char. C. Testa elongato-transversd vel ovato-oblongd, compressiusculd, tenut, 
valde inequilaterah, radiatim costatd, costis 20—22, angulatis, carinatis, et nodulosis ; 
margine ventrali convexiusculis ; umbonibus minimis, obliquis, depressis; lunuld minutis- 
simd, profundd, levigatd ; cardine angusto, dentibus elongatis. 
Shell elongately transverse or ovately oblong, slightly compressed, thin, very inequi- 
lateral ; radiatingly costated with 20 to 22 angular, carinated, and nodulous ribs ; ventral 
margin slightly curved; beaks small, depressed, Iunule deep and smooth; hinge narrow, 
teeth elongated. 
Length, 1% inch; height, {ths of an inch. 
Locality. Bracklesham Bay. 
This is an elegant species, and by no means rare at the above locality, to which it 
appears to be restricted. The shells are thinner and more fragile than those of the 
generality of species in this genus. The ribs upon this species are triangular and 
obsoletely tricarinate, that is to say, there are two faint rays, one on each side of the 
regular keel, which is in perfect specimens ornamented with nodules; the bases of the 
ribs meet, and there is no flat part in the interspaces. The siphonal region is rather 
compressed, or not so tumid as the pedal side. he interior is thickened in aged speci- 
mens, and the muscle-marks then deeply impressed. 
5. Carpita creBRisuLcata, Ldwards, MS. Tab. XXII, figs. 4 and 8. 
Spec. Char. C. Testd suborbiculari, inequilaterali, turgidd, crassa, subspherica, 
radiatin costatd, costis 20—24, angustis, squamosis, squamulis imbricatis ; umbonibus 
parum obliquis, cordatis; lunuld levigatd, concaviusculd ; cardine angusto, dente unico 
in valvd dextrd elongato ; dentibus duobus in altera valvd. 
Shell suborbicular, inequilateral, tumid, thick, nearly spherical ; costated ribs 20—24, 
narrow, and ornamented with numerous fine imbrications; umbones slightly oblique, 
heart-shaped ; lunule short, smooth, slightly depressed; hinge narrow; one elongated 
tooth in right valve, with a narrow depression in the left. 
Diameter, 3ths of an inch. 
Localities. Bramshaw and Huntingbridge (Zdwards). 
This much resembles sw/ca/a, but it has a larger number of ribs, and these are more 
prominent, nodulous and imbricated ; the interspaces are narrow and deep. 
‘There are also some other specimens, to which is attached the name of swbprofunda 
