BIVALVIA. 175 
4. Cuama squamosa, Solander. Pl. XXV, fig. 6 a—d. 
Cuama squamosa, Solander (in Brander). Foss. Hanton., pl. vii, figs. 86, 87, 1776. 
= — J. Sowerby. Min. Conch., t. 348, 1822. 
— _ G. B. Sowerby. Genera of Shells (Chama), fig. 4, 1839. 
Spec. Char. Testa crassa, suborbiculatd, irregulari, multilamellata, fimbriatd, longi- 
tudinaliter multistriatd aut radiatd; lamellis numerosis, incrassatis, subplicatis ; striis 
flexuosis ; umbone valve inferiore majore, contorto, aliquando producto ; cardine crasso, 
rUugoso. 
Shell thiek, suborbicular, irregular, covered with numerous fimbriated lamelle, and 
numerous longitudinal or rather radiating and bending or undulating striz ; lower or left 
valve the larger, with the umbo sometimes much produced; hinge with a large rugose 
tooth ; inner margin of valve smooth. 
Longest diameter, 13ths inch. 
Locality. Barton. 
This is very abundant at Barton, but I do not know it from any other locality, although 
it is given in Morris’s ‘ Catal. of Brit. Foss.,’ 2nd Edit., p. 194, as from Bracklesham Bay. 
In the ‘ Ann. du Mus.,’ vol. viii, p. 848, Lamarck refers his Paris Basin shell C. damellosa 
to the British species figured by Solander. Deshayes omits Solander’s name from his 
synonyms, giving his reasons for believing the French shell to be quite distinct ; and I am 
of his opinion. Our shell is very variable, but it is always closely radiated and fimbriated. 
Sometimes specimens are much distorted, resembling in that respect Diceras ; adhering 
only by the umbo, the shell twisting in a spiral manner, carrying up a depressed ridge of 
the deserted and disused connector (fig. 6 7). Some specimens are tinted with a reddish 
brown, which I imagine to be part of the original colour. 
5. Cuama suucata (?), Deshayes. Pl. XXV, fig. 7. 
Cuama sutcata, Desh. Coq. Foss. des Env. de Par., vol. i, p. 250, pl. xxviii, figs. 8, 9, 1825. 
— — Id. An. sans Vert. du Bass. de Par., vol. i, p. 585, 1860. 
Spec. Char. C.“ 7. ovato-orbiculatd, convend, turgidd, profundd, lamellosd, longitu- 
dinaliter multisulcatd ; lamellis trregularibus, brevissimis ; sulcis undulatis, numerosis, con- 
vexis ; dente cardinali oblongo, brevi, sulcato.””—Desh. 
Shell irregular, ovate or orbicular, convex, thick, tumid, deep, and lamellated ; longi- 
tudinally sulcated or radiated; concentrical or periodical lamellae irregular and short ; 
cardinal tooth short and sulcated. 
Localities. Bracklesham Bay and Barton (£dwards). 
France: Chaumont, Cale. gross. inf. (Deshayes). 
