BIVALVIA. 211 
are so intimately connected that no specific character can be pointed out, whereby it 
car possibly be distinguished or separated from it. 
In the recent shell the umbo appears, in the few specimens I have been able to 
examine, to be a little more lateral than in the generality of the Crag fossils, although 
this lateral incurvature of the umbo is quite as distinct in the extreme of its variation 
as in the living shell. Although considered as extinct by all previous authorities, and 
to which I submitted when compiling my own Catalogue, the possession of many 
more varieties, and further examination, have given me reason to dissent from that 
opinion. The lamellz of the fossil are not often preserved in Cabinet specimens ; 
when visible they are sharp and erect, and about equidistant, rather less prominent 
upon the posterior margin, but that is a character upon which two species in the living 
state have been formed, and is not much to be depended on; between the lamellee fine 
radiating striz are visible, corresponding to the crenulated margin of the interior. 
2. VeNuS FASCIATA, Dacosta. Tab. XIX, fig. 5a—c. 
PrcTuncuLus Fascratus. Dacosta. Brit. Conch., p. 188, t. xiti, fig. 3, 1778. 
Venus Paputa. Pulteney. Hutchins’ Hist. Dorset., p. 33. 
— — Mont. Test. Brit., p. 110, 1803. 
— rasciata. Don. Brit. Shells, vol. v, pl. 170, 1803. 
— — Phill. En. Moll. Sic., vol. ii, p. 34, 1844. 
— — Lovén. Ind. Moll. Scand., p. 39, 1846. 
— — Forb. and Hanl. Hist. Brit. Moll., vol. i, p. 415, pl. 23, fig. 3, pl. xxvi, 
fig. 7, and pl. 1, fig. 7, 1848. 
— Broentarti. Payr. Cat. Moll. Cors., p. 51, pl. i, figs. 23—25, 1826. 
— = Phil. En. Moll. Sic., vol. i, p. 43, 1836. 
CHIONE FASCIATA. Gray. List Brit. Moll., 1851. 
Ciaustna FAscraTa. Brown. Must. Brit. Conch., pl. xx, fig. 10, 1827. 
Dos1na — S Wood. Catalogue, 1840. 
PrecruncuLus Fascratis. List. Hist. Conch., lib, iii, sect. 4, fig. 114, 1688. 
Encyc. Method., pl. 276, fig. 2. 
Spec. Char. Testdé crassd, compressiusculd, ovato-trigond vel sub-cordatd, inequi- 
laterali, latere postico longiore ; lamellatd, lamellis crassis, recurvis, distantibus ; lunuld 
elongato-cordatd ; umbonibus prominulis. 
Shell thick, somewhat compressed, triangularly ovate, inequilateral, posterior side 
the longer, and very little pointed; covered with thick, distant, and slightly recurved 
lamelle, or concentric ridges ; lunule elongated, heart shape. 
Length, $ths of an inch; height, ths ditto. 
Localities. Red Crag, Sutton, Walton-on-the-Naze. 
Mam. Crag, Bramerton. 
Recent, Mediterranean, Britain, Scandinavia. 
I have only met with true and genuine specimens of this species as far back as the 
Red Crag, where it was not very abundant. The young state of Venus imbricata, in 
some of its forms, strongly resembles this shell, except where the lamellz are well pre- 
