BIVALVIA. 173 
and somewhat distant imbrications, with oftentimes elongated and sometimes tubular 
spinous processes ; outer surface covered with radiations, inner margins smooth ; mark of 
attachment variable. 
Diameter, 1+ inch. 
Localities. Bracklesham Bay (&dwards). 
France: Parnes, Chaumont, Grignon, Calc. gross. moyen et sup. 
(Deshayes). 
Sinde (Deshayes). 
The name of punctata was proposed for this species by M. D’Orbigny as one of prior 
date, but the shell to which this name was given by Bruguiere is a species now living in 
the sea near Guadaloupe, as stated by M. Deshayes, and is quite distinct, in which opinion 
I coincide. Lamarck, therefore, appears to have been the first to describe the present 
fossil, and the above name has been generally employed. The inside lining of the shell 
is deeply and regularly punctulated, looking like the encrustation of Polyzoa, but this is 
not visible on the impressions of the adductor muscles. This is strongly marked ; and the 
two valves are very differently ornamented. The principal characters are the long spmous 
fringes and the large radiating ridges between the lamin upon the right or upper valve ; 
between the distant laminz of the lower valve the shell is ornamented with granules 
arranged in a somewhat zigzag manner, very visible in perfect specimens from Grignon, 
but indistinct upon the only individual of this lower valve that I have seen from our own 
beds. The shell is attached by the left valve, and the mark of adherence is generally 
small, as shown by the French specimens. 
This is a rare shell in our English beds. 
2. Cuama FimBriata (?) Defrance. Pl. XXV, fig. 8. 
Cuama Fimsrtata, Defrance. Dict. des Sci. Nat., vol. vi, Suppl., p. 65, No. 3, 1818. 
—_ Desh. An. sans Vert. du Bass. de Par., vol. i, p. 584, pl. lviu, 
figs. 23—25, 1860. 
— ponpeErosa, Id. Coq. Foss. des Env. de Par., vol. i, p. 248, pl. xxxvii, 
figs. 9, 10, 1825. 
Spec. Char. Ch. “ Testa orbiculatd, incrassatd, irregulari, convexd, multilamellata, 
intus levigatd ; lamellis valve inferioris brevibus, simplicibus ; valve superroris longioribus, 
laceris, plicatis ; dente cardinale magno valde sulcato.” —Deshayes. 
Shell orbicular, thick, irregular, convex, and covered with numerous and _close-set 
lamell ; inside smooth ; reflected ridges close and numerous. 
Diameter, 2 inches. 
Localities. Bramshaw (dwards). 
France: Auvers, Valmondois, &c., Sables moyens (Deshayes). 
