BIVALVIA. 175 
2. ASTARTE PARVULA, S. Wood. ‘Tab. XVII, fig. 11 a—d. 
ASTARTE PARVULA. S. Wood. Catalogue, 1840. 
Spec. Char. Testé minimd, obliquad, ovato-triangulari, inequilaterali, compressiusculd, 
sublevi ; postice latiore: antice longiore, et productiore ; margine integerrimo. 
Shell minute, oblique, of a triangularly ovate form, inequilateral, somewhat com- 
pressed, nearly smooth; posterior side very short and broad, anterior produced and 
elongated ; margin smooth. 
Length, 4th of an inch; height, 25th ditto. 
Locality. Cor. Crag, Sutton. 
This is also an abundant shell at Sutton, but rarely obtained with the valves 
united. It is a true As/arte, and may be distinguished from the preceding, which 
is the species it most resembles, and for the young of which, without care, it might be 
mistaken; its differences are principally in outline, this bemg much more inequilateral, 
and in place of having the form of an imperfect equilateral triangle, like that of 
A. triangularis, the lines of the margins form with the umbo nearly a right angle; 
the posterior side is particularly short, with a very gentle curve to the ventral margin, 
while the anterior is very much produced, sloping in a straight line to within a short 
distance of the extremity, considerably reducing the breadth, or rather height, of that 
side; the hinge is furnished with one large triangular tooth in the right valve, as in 
all the species of the genus, with two in the left, and the prominent marginal or 
lateral tooth of the right valve, which fits into a corresponding depression in the left, 
is on the posterior side, while on the anterior side of the umbo, the elevated ridge is in 
the left valve, and at a considerable distance; the exterior is generally smooth, but in 
perfect specimens, obsolete, concentric ridges, though not very regular, may be 
detected. 
The shell in its recent state was probably of a reddish-brown colour, like the 
preceding species, traces of which remain in some specimens, and in others it is also 
formed into concentric bands. The margin in all my specimens is free from the least 
appearance of crenulations, as well in those which are the largest, and presumed to be 
full grown, as in the smaller and consequently younger. 
3. ASTARTE BOREALIS, Chemnitz. Tab. XVI, fig. 3 a—d. 
VENUS BOREALIS. Chem. Conch. Cab. vii, t. xxxix, fig. 412, 1784. 
— compressa. Mont. Test. Brit. Suppl., p. 43, t. xxvi, fig. 1, (large fig.) 1808. 
— svutcata. Mat. and Rack. Linn. Trans., vol. viii, p. 81, t. ii, fig. 2, 1807. 
ASTARTE PLANA. Jd. Sow. Min. Conch., t. 179, fig. 2, 1817, (not Nyst.) 
— — Id. Geol. Norf., p. 43, t. ii, fig. 14, 1833. 
—  sorgaLis. S. Wood, Catalogue, 1840. 
— _— Phil. Neuer. Conch., vol. ii, p. 58, Astarte, pl. i, fig. 11. 
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