176 EOCENE MOLLUSCA. 



The lamellae are dwarfish and the rays broad, flat, and regular. The specimen figured 

 is a lower valve, and had been attached by nearly half the entire surface. The rays 

 are much more numerous than upon Cli. squamosa. The inner lining of this shell is 

 without punctures. The tooth of the lower or adherent valve is rugose ; so also is the 

 place of its reception in the opposite valve. 



6. Chama Selseyensis, Edwards MS. PI. XXV, fig. 5. 



S])ec. Char. Testa orhiculafo-rotundatd, inflatd, valvd sinistrd majore ; umbonibus obliquis, 

 incurvatis ; lamellis transversis distantibus, acutis, interstitiis Icevigatis ; cardine unidentato 

 in valvuld sinistra. 



Shell more or less rounded and inflated ; left valve the lower and larger ; beaks 

 oblique and incurved, covered with smooth and sharp lamellae ; interstices free from 

 radiations ; one tooth in the left valve. 



Diameter, 1 inch. 



Locality. Selsey {Edwards). 



Several specimens of what is here considered as a distinct species are in Mr. Edwards's 

 cabinet, all exhibiting the same peculiarly smooth character like the one figured, from 

 which it seems to have been entitled to specific isolation. I believe it is so, and have 

 adopted the MS. name. It appears to be distinguished ivom gic/as by the smoothness 

 of the exterior and the freedom from fimbriated lamellse. It somewhat resembles Ch. 

 inornata, Desh. (pi. Iviii; figs. 20 — 22), and might possibly be the same if a large series of 

 each could be examined and compared ; but the French shell seems to be elaborately 

 ornamented with undulating fimbriae, and I have preferred keeping it as a distinct species 

 for the present. 



7. Chama turgidula (?), Lamarck. PI. XXV, fig. 9 a — c. 



Chama tuegidula, Lam. An. sans Vert, 2nd ed., t. vi, p. 585, fide Desh., 1860. 



— KUSTICXJLA, Desk. Coq. Foss. des Env. de Par., p. 249, pi. xxxvii, figs. 7, 8, 1825. 



— substeiata, Id. Ibid., pi. xxxviii, figs. 1 — 3, 1825. 



Spec. Char. Ch. Testa suborbiculatd, convexd, crassd, multilamellatd, longitudinaliter 

 multistriatd ; lamellis numerosis incrassatis, subplicatis ; striis flexuosis, approximatis ; 

 wnbone valvce inferioris contorto. 



Shell suborbicular, convex, thick, numerously striated with somewhat close-set fimbriae ; 

 umbo of inferior valve incurved. 



Diameter, 1 inch. 



Locality. Barton. 



