178 MOLLUSCA FROM THE CRAG. 
and smooth lunule, and an elongated corselet on the posterior side; there is an 
elevated ridge of the dorsal margin in the right valve, and a correspondent furrow on 
the same side in the left: the anterior lateral tooth or ridge is in the left valve, and 
the corresponding furrow on that side in the right; there are three teeth in the right 
valve, one large and two very small, with two large teeth in the left one; the large 
central triangularly-formed tooth is ridged or roughened on its sides, and the same 
may be seen in perfect specimens on the inner side of the two diverging teeth of the 
left valve. 
5. ASTARTE INCRASSATA? Broccht. Tab. XVI, fig. 6 a—0. 
Venus rncrassata. Broc. Conch. Foss. Subap., p. 557, t. xiv, fig. 7, 1814. 
Crasstna tncrassaTa. Desh. 2d edit. Lam., t. vi, p. 257, 1835. 
ASTARTE — Goldf. Pet. Germ., vol. ii, p. 194, t. 135, fig. 2 a, 6. 
— — Phil. En. Moll. Sic., vol. i, p. 38, vol. u, p. 29. 
— nitipuLa. S. Wood. Catalogue, 1840. 
Spec. Char. Testd crassa rotundato-triangulari, tumiduld, subequilateral, postice paullo 
longiore, levi, preterquam ad apices ; lunuld ovata, profundd ;-margine crenulato. 
Shell thick, roundedly triangular, slightly inflated, subequilateral, posterior side 
rather the longer; smooth, except at the umbones ; lunule ovate, and deep; margin 
crenulated. 
Diameter, #ths of an inch. 
Localities. Cor. Crag, Sutton, Sudbourn. 
Red Crag, Sutton. Recent, Mediterranean ? 
This species is abundant in the Coralline, and it is occasionally met with in the 
Red Crag. Although somewhat variable as a British fossil, it is less so than many 
other species of this genus. It most resembles the shorter varieties of the preceding, 
but may be distinguished by several characters that appear to be permanent. Our 
Crag species has its identification in a Sicilian fossil, which is presumed to be the 
same as Ast. incrassata, Phil., and V. incrassata, Broc., the former of these two authors 
speaks of his shell as very variable in its external appearance, some, he says, are almost 
smooth, whilst others are sulcated almost to the margin; our Crag specimens are 
generally very regular in that character, and only in the region of the umbones is the 
shell at all ridged, and these extend only to a short distance, while all the rest of the 
surface is perfectly smooth. The shell as represented by Brocchi, is free from ridges 
of any kind, although in the text, p. 557, he says, “natibus transversim rugosis.” 
The general form of our shell is somewhat angulated or truncated at the posterior 
side, the umbones turning a little towards the anterior one, over a large and deep 
lunule, and on the other side is a large lanceolate corselet, within which is a con- 
siderable space that was occupied by the ligament; the umbonal region is occupied 
by numerous small and rounded ridges, and the margin of the adult shell is deeply 
crenulated. 
