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, 1/77. 



— — Forbes. JEgeau Invert. Rep. Brit. Assoc, p. 182, 1843. 

 _ _ Lovt:'n. Ind. Moll. Scand., p. 40, 1846. 



— — Forb. and HmiI. Hist. Brit. Moll., vol. i, p. 419, pi. xxxiv, fig. 2, .<md 



pi. xxvi, fig. 1, and pi. h, fig. 6, 1848. 



— KADIATA. Broc. Conch. Foss. Subap., p. 543, t. xiv, fig. 3 a, b, 1814. 



— — Bast. Mem. Sec. 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. 



— SPADICEA. Renieri. Fide Brocchi. 



— — Ni/st. Coq. Foss. de Belg., p. 165, pi. ii, fig. 3, 1844. 



— PECTINULA. Desk. 2d. edit. Lam., t. vi, p. 348, 1 35. 



Carbium striatum radiatum. Walk, and Boys, Test. Min. Ror., p. 23, fig. 82, 1787. 

 TiMOCLEA ovata. Brown. Illust. Brit. Conch., pi. xix, fig. 11, 1827. 



— Pennantii. Leach, MS. Fide Brown. 

 Cytherea ovata. Fleming. Brit. An., p. 445, 1828. 

 Chione ovata. Crray. List of Brit. Moll., p. 11, 1851. 



Spec. Char. Testa ovato-trigonuld, incequilaterali, crassd, antice rotundatd, postice 

 angulatd; radiatim sulcata, sulcis granulatis ; lunuld distinctd elongato-cordatd ; margine 

 tenuissime cremdato. 



Shell triangularly ovate, inequilateral, thick ; anterior side rounded, posterior very 

 slightly elongated ; covered with radiating, bifurcating, and granulated strise ; lunula 

 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 httle 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. /3, 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. 



