228 MOLLUSCA FROM THE CRAG. 
left valve with one cardidal subbifid tooth, and elevated dorsal margins to interlock 
with the lateral teeth of the opposite valve. One side of the right valve is somewhat 
compressed, causing thereby a difference of form in the siphonal scar. 
The nearest approach to this species that I am acquainted with is 7. damellulata, 
F. Edwards, ‘ Lond. Geol. Journ.,’ vol. i, p. 14, pl. 23, fig. 2, but that shell seems rather 
more equilateral, flatter, and less truncated, with more numerous elevated lamelle. 
M. Edwards’ specimens are not in very good preservation. 
3. TELLINA OBLIQUA, J. Sowerby. Tab. XXI, fig. 7, a—d. 
TELLINA oBLIQUA. J. Sow. (not Lamk.) Min. Conch., t. 161, fig. 1, 1817. 
a= — Nyst. Coq. Foss. de Belg., p. 107, pl. 5, fig. 2, 1844. 
— == Lyell. Elem. of Geol., 2d ed., p. 299, fig. 14, 1841. 
Spec. Char. Testa subrotundatd, obliqud inequilaterali, crassd, levigatd vel irregu- 
lariter striata ; anticé rotundaté ; posticé truncatd, subangulata ; cardine bidentato, denti- 
bus lateralibus obsoletis. 
Shell rather rounded, oblique, inequilateral, thick, and strong; anterior side 
rounded ; posterior truncated or subangulated, smooth, or covered with irregular lines 
of growth; hinge with two cardinal teeth, lateral teeth obsolete. 
Length, \& inch. Height, 1& inch. 
Locality, Cor. Crag, Sudbourn, Ramsholt. 
Red Crag, Sutton, Bawdsey, Felixstow, Ipswich. 
Mam. Crag, Chillesford. 
This shell first appears in the lower or Coralline Crag, where it is not very 
abundant; in the succeeding period, or Red Crag, it may be found in most locali- 
ties. The species may be called obliquely circular, or rather lenticular, the height 
being very nearly if not quite equal to the length; the valves are somewhat tumid, and 
covered with irregular lines of growth, and the posterior side is rather the shorter of 
the two, with the fold very far back; this side is compressed in the right valve, but 
tumid in the left; the mequality of the two valves at that part having relation to the 
unequal magnitude of the siphonal scar in the different valves ; the lateral teeth may 
be said to be wholly wanting, as in the proximate genus Psammodia. 
4. TELLINA LATA, Gmelin. Tab. XXI, fig. 6, a—d. 
TELLINA LATA ALBA. List. Hist. Conch., fig. 253, 1686. 
— ata. Gmel. 1788. (Not Quoy and Gaim.) Fide Lovén. 
— _ Midden. Sibiria Reise, vol. ii, part 1, pl. 23, figs. 4, 5, 
— — Lovén. Ind. Moll. Seand., p. 41, 1846. 
