BIVALVIA. 213 
2. VENUS ovATA, Pennant. Tab. XIX, fig. 4 a—d. 
Venus ovata. Penn. Brit. Zool., vol. iv, p. 206, t. 59, fig. 3, 1777. 
—- — Forbes. Aigean Invert. Rep. Brit. Assoc., p. 182, 1843. 
- — Lovén. Ind. Moll. Scand., p. 40, 1846. 
— — Forb. and Hanl. Hist. Brit. Moll., vol. i, p. 419, pl. xxxiv, fig. 2, and 
pl. xxvi, fig. 1, and pl. 1, fig. 6, 1848. 
— rapiata. Broc. Conch. Foss, Subap., p. 543, t. xiv, fig. 3a, 6, 1814. 
— — Bast. Mem. Soc. d’Hist. Nat. de Par., t. ii, pt. i, p. 89. 
= — Marcel de Serres. Geog. des Terr. Tert., p. 150, 1829. 
— _— Phil. En. Moll. Sic., vol. i, p. 44, vol. ii, p. 34. 
— spapicna. Renieri. Fide Brocchi. 
— _— Nyst. Coq. Foss. de Belg., p. 165, pl. ii, fig. 3, 1844. 
— PECTINULA. Desh. 2d. edit. Lam., t. vi, p. 348, 1 35. 
CARDIUM STRIATUM RADIATUM. Walk. and Boys, Test. Min. Ror., p. 23, fig. 82, 1787. 
Trmocina ovata. Brown. Ilust. Brit. Conch., pl. xix, fig. 11, 1827. 
— Prennantit. Leach, MS. Fide Brown. 
CyTHEREA OvATA. Fleming. Brit. An., p. 445, 1828. 
Curone ovata. Gray. List of Brit. Moll., p. 11, 1851. 
Spec. Char. Testa ovato-trigonuld, inequilaterali, crassd, anticé rotundatd, postice 
angulatd ; radiatim sulcatd, sulcis granulatis ; lunuld distinetd elongato-cordatd ; margine 
tenuissime crenulato. 
Shell triangularly ovate, inequilateral, thick; anterior side rounded, posterior very 
slightly elongated; covered with radiating, bifurcating, and granulated strie; lunule 
elongated, heartshaped ; margin very finely crenulated. 
Length, ths of an inch; height, $ an inch. 
Localities. Cor. Crag, Sutton, Gedgrave. 
Red Crag, Sutton. 
Recent, Mediterranean, Britain, Scandinavia. 
This shell is exceedingly scarce in the Red Crag, but in the older or subjacent 
deposit it is particularly abundant, more especially at Sutton, where the specimens are 
almost entirely of one variety, in which the rays are finer and flatter, bifurcating about 
the middle of the shell, giving, on the outer portion, as many as forty or fifty ridges ; 
those which are found at Gedgrave have the rays larger, more elevated, and rounded, 
with a more roughened surface, and are seldom divided, having also a wider space 
between them: in the other variety they are but little imbricated, and have the 
intermediate spaces or sulci very narrow; the form is somewhat variable, but in 
general the older shell has comparatively a greater length than in the young state, and 
is always a little longer than it is high; upon the Gedgrave shell, or var. 9, there is an 
obtuse ridge upon the posterior side, behind which the rays are closer and more 
numerous ; this corresponds with the Italian fossil, V. radiata, Broc., while the Sutton 
specimens more resemble the common form of the recent British shell. 
This species is said to be abundant in the British seas, with a vertical range from 
three to one hundred fathoms; it is found fossil at Stromstadt. 
