146 EOCENE MOLLUSCA. 



lateral; costated with 15 to 18 sharp, elevated, and somewhat distant ribs; lunule large, 

 smooth, depressed ; beaks prominent, slightly incurved ; hinge very thick. 



Diameter, l^th of an inch. 



Locality. Lyndhurst (/. Soioerht/); Brockenhnrst {Edwards). 

 Belgium : Hoesselt, Vliermaet, and Lethen {Ni/st). 



This is a handsome shell, and it is more readily distinguished than the generality of 

 species in this genus ; its deltoid form and great elevation of umbo are its most prominent 

 features. The costse are distant, especially towards the pedal region, triangular in shape, 

 with broad interspaces ; the top of the rib is small, not sharp, rather flattened, but 

 narrow; the hinge is broad in consequence of its elevated umbo, teeth large, and the 

 muscle-marks deeply impressed. It is, I am told, abundant at Brockenhurst, where 

 the valves are frequently found united. In Morris's ' Cat. Brit. Foss.' it is quoted from 

 Barton, but I have not seen it from that locality. 



8. Cardita elegans, Lamarck. Tab. XXII, fig. 16, a, b. 



Venericardia elegans. Lam. An. du Mus., t. vii, p. 59, No. 10, and t. ix, pi. 32, 



fig. 3, a, b. 1807. 

 — — Desk. Hist, des An. des Env. de Par., t. i, p. 157, pi. 26, 



figs. 14—16. 1824. 

 Cakdita — mjst. Coq. foss. de Belg., p. 215, pi. 17, fig. 2, 1843. 



— — /. Sow. In Dixon's Geol. of Suss., p. 169, pi. 3, fig. 15. 



1850. 



— — Desk. Au. sans Vert, du Bass, de Par., t. i, p. 772, 1859. 



Spec. Char. C. " Testa subrotundd, depressiuscidd, tenue costatd ; costis numerosis, 

 compressis, eleganter sqiiamosis ; lunula ovato-JanceoIatd." {Deshayes.) 



Shell somewhat rounded and slightly depressed, with numerous ribs, thin, compressed, 

 and elegantly ornamented ; lunule ovately elongated. 



Diameter, f ths of an inch. 



Localities. Bracklesham, Stubbington {Edwards). 



France: Grignon, La Montague de Laon, Soissonais (ZJe^/^a^e'^). 

 Belgium: Foret, Laeken {Nj/st). 



This species is by no means rare in England, and I believe it is also abundant in 

 France ; it much resembles the young state of C. imbricata, but our present shell never 

 attains to the magnitude of that species ; it differs in being rather more tumid, and 

 there is also a slight difference in the costae, which in this species are less numerous, 

 varying from 17 to 20 ; there is likewise a greater interspace between the ribs, and the 

 ribs themselves are more nodulous than they are in imbricata. 



There is a variety from Bramshaw, in which the ribs are sharper and higher (var. 

 siibelegans) . 



