8 MOLLUSCA FROM THE CRAG. 
This genus is found in the Secondary Rocks; one species has been described by 
Mr. Bean, from the Cornbrash ; ‘ Mag. Nat. Hist.’ 1839. And some from the Green- 
sand by Dr. Fitton. 
1. ANom1A EpHIPIUM, Linneus. Tab. I, fig. 3, a—d. 
Anomia EpHIPPIUM. Zinn, Syst. Nat. ed. 12, p. 1150, No. 218, 1767. 
—  squamuta. Id. - - - p. 1151, No. 221. 
ces oe Turt. Brit. Biv. p. 229, pl. 18, fig. 5-7, 1822. 
— — Broce. Conch. Foss. Subap., p. 461, 1814. 
— — Dekay. Nat. Hist. New York (Zool.), p. 168, pl. 12, fig. 209, 1843. 
— — Middendorff. Malacozoologia Rossica (Mem. de l’Acad. des Sc. Imp: 
de St. Petersb.), p. 519, t. 11, fig. 18-21, 1849. 
— suLcaTa. Poli. Test. Sic. vol. ii, p. 186, t. 30, fig. 12. 
—  MarGarivTacka. Id. - - t. 30, fig. 11. 
— C@PA. Td. - - - t. 36, figs. 1, 25-8. 
— LENS? Goldf. Pet. vol. ii, p. 40, t. 88, fig. 8, a—e. 
—  epurprium. S. Wood. Catalogue, 1840. 
— costaTa. Broce. Conch. Foss. Subap., p. 463, t. 10, fig. 9, 1814. 
—  eaprata? = Id. - - - =eeeten!Osetips TO: 
—  sutcata? Td. - oS - - - t. 10, fig. 12, 
Spec. Char. Testé polymorpha, crassé vel tenui, plerumque lavigata, forma valdé 
arregulart. 
Shell many shaped, thick and strong, sometimes thin and fragile, generally smooth, 
form very irregular. 
Diameter, #ths of an inch. 
Locality, Cor. Crag, Sutton, Sudbourn. 
Recent, Mediterranean, Britain, Scandinavia, North America. 
The variety of this species, called squamula, is exceeding abundant in the Coratline 
Crag, and like the recent shell, is subject to great distortion, depending upon the 
body to which it has been attached; a large number of these specimens have taken the 
characters of the genus Pecten, to which, in the living state they were attached, but it 
is only in the upper or free valve that I have been able to observe the costated form, the 
lower or adherent one was probably much thinner, and less capable of preservation. 
A few specimens of the lower or perforated valve are occasionally met with, and in 
all that I have seen, the valve is externally smooth, at least, free from striz or cost, 
and its place of attachment was some smooth or even surface. This variety does not 
appear to have attained the size of more than 3ths of an inch in diameter, and the 
majority of specimens have not reached above half those dimensions. In those 
which have the upper valve quite flat and smooth, the place of attachment was 
probably the mterior of some shell, from which the lower valve would take the 
convex form, giving room between the two for the occupation of its inhabitant. The 
beak or umbo of this species, is almost immediately at the margin or projecting a 
little beyond it. ; 
