BIVALVIA. 143 
DOUBTFUL. 
4. LucINA COLUMBELLA, Lamarck. 
LucINA COLUMBELLA. Lam. Hist. des An. s. Vert., t. v, p. 543, No. 15, 1818. 
—_— — Basterot. Mém. Geol. des Eny. de Bord., p. 86, pl. 5, fig. 11, 1825. 
_ — Bronn. Lethza Geogn., p. 959, t. 37, fig. 15, a—d, 1837. 
— —_— Dujard. Mém. de la Soc. Geol. de France, tom. ii, pt. 2, p. 248, 
1837. 
= = Dubois de Mont. Foss de Wolhyn., p. 57, pl. 6, figs. 8—11, 1831. 
= = G. B. Sowerby. Genera of Shells, No. 27, fig. 6. 
= — Phil. En, Moll. Sic., vol. ii, p. 26, 1844. 
— — Reeve. Conch. Icon. Lucrna, pl. 6, fig. 30. 
— VULNERATA. De France, sec. Basterot. 
Three specimens of this species are among the Red Crag Fossils in the Wood- 
wardian Museum at Cambridge; and as it will be seen by the above references, it 
was an inhabitant of the Seas which deposited the Bordeaux Beds, found also in the 
Faluns of Touraine, in the Plateau Wolhyni-Podolien, and according to Philippi, has 
been obtained at Sortino, in the Val di Noto, it is very possible it may have had 
an extension into the Red Crag, more especially as a shell resembling this tpeabHily 
only a variety) is still a living species on the N. W. Coast of Africa. 
No satisfactory information respecting these so called Red Crag specimens could, 
however, be given by any of the gentlemen connected with the Cambridge Museum, 
although Professor Sedgwick says he believes them to be true Crag shells, but being 
myself unable thoroughly to examine their lithological character, and never having 
seen the same species in any other Collection of Crag Fossils, and in the absence of all 
knowledge of their correct locality, they must, at least for the present, be considered 
as not strictly entitled to a place in the undoubted Fauna of that Period. 
DipLoponta,* Bronx. 1831. 
TELLINA (sp.). Mont., 1803. 
Mysta (sp.). Leach, MS.,1819. Brown, 1827. 
VeENUus (sp.). Broc. Nyst. 
Lucina (sp.). Def. Desh. 
Dietoponta. Bronn., 1831. 
SpH®RELLA? Conrad, 1838. 
Generic Character. Shell somewhat thin, more or less orbicular, equivalve sub- 
equilateral, externally smooth, or slightly marked by lines of growth, umbones not 
very prominent. Hinge composed .of two cardinal teeth in each valve, the anterior 
one in the right valve simple, the other bifid, and the reverse in the left, no lateral 
* Etym. Armddos, double, ddovs, a tooth. 
