186 MOLLUSCA FROM THE CRAG. 
deeply coloured in its living condition, as in some specimens a tinge of this remains, 
and in others there are vestiges of coloured bands. 
Sir Charles Lyell speaks of a fossil in the Miocene Deposits of America as allied to 
this species, and a specimen in my Cabinet from Savigny very closely resembles it, and 
is probably only a variety with the ridges rather larger, and the intermediate spaces 
broader. 
13. ASTARTE INCERTA, S. Wood. Tab. XVII, fig. 4. 
AsTARTE PLANA. Nyst. Coq. Foss. de Belg., p. 161, pl. xi, fig. 2a—é, 1844. 
Testd orbiculato-ovatd, compressa, subinequilaterali, regulariter striata; natibus pro- 
minulis; lunula ovatd, levigatd; margine crenulato. 
Shell roundedly ovate, compressed, somewhat inequilateral, regularly striated ; 
umbo slightly prominent; lunule ovate and smooth; margin crenulated. 
Length, ths of an inch; eight, ths ditto. 
Locahties. Cor. Crag, Sutton, Gedgrave. 
Belgium. 
This species is not very abundant in our Crag. As it is perfectly distinct from 
A. plana, of ‘Min. Conch.,’ to which species the Belgian fossil was referred, and which 
appears to be the same as the English Crag shell, I have proposed for it a new name; it 
approaches very near to one of the varieties of 4. gracilis, but the differences are such 
as seemingly to justify a removal. It is flatter or more compressed than any of the 
numerous specimens of that species that I have seen, and is more equilateral, with a 
greater height. In the full grown shell, and in good condition, the margin is regularly 
and deeply crenulated, differing thereby most essentially from 4. plana, as also in being 
covered with small and regular ridges. It is stated to be abundant in Belgium, where 
it has attamed to rather larger dimensions. 
14. ASTARTE CREBRICOSTATA? Forbes. Tab. XVII, fig. 6. 
ASTARTE CREBRICOSTATA. Forbes. Annals Nat. Hist., vol. xix, p. 98, pl. ix, fig. 4, 1847. 
_ — Jeffreys. Ann. and Mag. of Nat. Hist., vol. xix, p. 314. 
ae os Forb. and Hanl. Uist. Brit. Moll., vol. i, p. 456, pl. xxx, fig. 9, 
1848. 
— — Gray. List of British Mollusca, p. 92, 1851. 
Spec. Char. Testa ovato-trigond, compressiusculd, crassd, subinequilaterali, postice 
potius longiore; concentrice costatd, costis crebris obtusis, ad postice evanescentioribus, 
margine crenulato. 
Shell ovately trigonal, slightly compressed, thick, nearly equilateral, posterior side 
rather the longer, concentrically costated ; ribs or ridges numerous. thick and obtuse, 
obsolete on the posterior part ; margins crenulated. 
