BIVALVIA. 19 
became attached by the exterior of the shell, but always preserve their regularity or 
partial freedom. The exterior of the shells in this Genus have not the regularly 
radiating form of strie or cost, so characteristic of the Pectens or fans, but they are 
ornamented with arched or lamellated fringes or squamose appendages, more re- 
sembling the exterior of Spondylus, to which they appear to have considerable affinity, 
and, indeed, may be considered as a connecting link between Ostrea and that Genus, 
differing from the former in having distinct auricles in the young state, and in adhering 
by a different valve; and from the latter, in the absence of those dental characters 
prominently exhibited in Spondylus. 
A few species only are at present known, and those all in a fossil state; two or 
three are peculiar to the Tertiary Formations, and one has been figured by Mr. Sowerby 
in ‘Min. Conch.,’ from the Inferior Oolite of this country. 
1. Hinnites Cortesyi, De France. Tab. III. 
Hinnires Corresyi. De France. Dict. des Sci. Nat., t. 21, Art. Hinnites, p. 169, Atlas, 
fig. 1, la, 1821. 
— —_— De Blainv. Malac., pl. 61, fig. 1, 1825. 
_ — Desh. 2d edit. Lam., tom. vii, p. 150, 1836. 
— — Chenu. Ill. Conch. Hinnites, pl. 1, fig. 4. 
—  Corrsstanus. De Blainville. Dic. des Sci. Nat., t. 32, 311, 1824. 
—  Dvusurssonz. J. Sowerby. Min. Conch., t. 601, 1829. 
— _ Woodward. Syn. Tab. of Org. Rem., p. 20, 1830. 
— — Td. Geol. of Norf., p. 44, 1833. 
Hinnus Dusurssont. J. Sow. Syst. Ind. to Min. Conch., p. 244, 1835. 
= — S. Wood. Catalogue, 1840. 
_— — J. Morris. Catal. Brit. Foss., p. 110, 1843. 
Spec. Char. Testd magna, ovata, depressd, crassd, radiatim et undulatim costata ; 
transversim squamoso-lamellosa ; auriculis inequalibus; sulco cardinal, prelongo, et profundo. 
Shell large, ovate, depressed, thick, and strong, with radiating and undulating coste ; 
ribs covered with squamose projecting lamelle; auricles unequal; and a deep and 
elongated sulcus for the ligament. 
Length, 5 inches. Hezght, 6 inches. 
Locality, Cor. Crag, Ramsholt. 
Although a shell of great strength and solidity, it is by no means abundant as a 
British fossil, and I have seen it only from one locality, and that in the Coralline Crag. 
The specimen now figured was from a less disturbed part of that deposit, where the 
two valves of many of the Bivalvia are found in their natural position; while the one 
figured in ‘Min. Conch.’ was from a single valve. A few other specimens were 
obtained by W. Colchester, Esq., from the same spot, and these constitute all that 
I have as yet seen. 
A perfect representation of the Genus Pecten is exhibited in the young shell, and 
it must then have been difficult to have pointed out a character by which it could be 
