BIVALVIA. 11 



A few specimens resembling the figure, and corresponding with the description of 

 what the authors of ' Brit. Moll.' have considered as distinct, are in my cabinet, from 

 the Coralline Crag : they consist of the upper valve only, which is somewhat finely 

 striated over the earlier formed part of the shell, while the latter or outer portion is 

 covered with larger and coarser radiations. The umbo is rather more prominent, and 

 placed at a greater distance from the margin than in Ephippium, a broad triangular 

 fossette beneath the umbo received the ligament, and the upper valve in my Cor. Crag 

 specimens is nearly flat. A number of specimens of the upper valve, from the 

 Red Crag, present characters by which they may be referred to the above recent 

 species, and are uniform in their exterior markings, having large and undulating ribs 

 or broad and elevated striae (fig. 4, a). This is the only species or variety, that I have 

 been able to obtain from the Red Crag, and those specimens, as might be expected, in 

 that deposit, consist of the upper or thicker valve only ; this is pretty uniform in 

 shape, which is nearly orbicular, though the diameter in some is greater from the 

 umbo to the ventral margin, in others it is the reverse. 



4. ANOMTA STRIATA ? Brocchi, Tab. II, fig. 3. 



SQUAMA MAGNA ? Chem. Conch. Cab., t. viii, p. 87, pi. 77, fig. 697. 

 ANOMIA STRIATA? Broc. Conch. Foss. Subap., p. 471, t. 10, fig. 13, 1814. 

 ? Loven. Ind. Moll. Scand., p. 29. 

 ? Gold/. Pet. Germ., t. ii, p. 39, tav. 88, fig. 4, ac. 



Phil. En. Moll. Sic., vol. ii, p. 66, 1844. 

 ? Forb. and Hani. Hist. Brit. Moll., vol. ii, p. 336, pi. 55, figs. 1, 6, and 



pi. 53, fig. 6, 1849. 



RUGOSA. Nyst. Coq. Foss. de Belg., p. 312, pi. 24, fig. 6, 1844. 

 SQUAMA? W. Wood. Ind. Test., p. 55, pi. 11, fig. 11, 1825. 

 ? Brocchi. Conch. Foss. Subap., p. 462, No. 4, 1817. 

 ? Ency. Meth., pi. 171, fig. 22. 



Spec. Char. Testa variabile, orbiculata, vel transverse ovatd, discoided, radiatd; striis 

 creberrimis, imbricato-squamulatis ; umbone submarginali. 



Shell variable, ovate, orbicular or discoidal ; sometimes transversely ovate, covered 

 with numerous radiating, rather rough or imbricated striae ; umbo submarginal. 



Diameter, 2 inches. 



Locality. Cor. Crag, Button, Sudbourn, and Gedgrave. 



Recent, Britain and Scandinavia. 



A large number of loose valves in my cabinet, from the Coralline Crag, correspond 

 with the figures and description as given of the recent shell under this name, which is, 

 probably, the same as the fossil one figured by Brocchi, although that shell appears to 

 have the umbo rather nearer to the margin. Ours may be described as variable in 

 form, the upper valve sometimes flat, in others convex, covered over with numerous 

 subimbricated strise, with the umbo a little distant from the edge. 



