CARDITA. 121 



Measurements : 



(1) (2) 



Length . . . 8 . 7'5 mm. 



Umbo to postero-ventral angle . 12 . 11*0 „ 



(1, 2) Haldon. 



Affinities. — This species may perhaps be related to 0. eenomanensis, Gueranger, 1 

 but the figure of the latter is too indistinct for recognition. 



Remarks. — There are four examples of this species in the Vicary Collection, 

 British Museum. 



Distribution. — Upper Greensand (zone of Schlambachia rostrata) of Haldon. 



Family— CARDITID^E, Gill. 



Genus — Cakdita, J. G. Bruguiere, 1792. 2 

 (' Encyc. inetli., Vers,' vol. i, p. 401.) 



Cardita? fenestkata (Forbes), 1845. Plate XVIII, figs. 2-4. 



1845. Venus ? fenesteata, E. Forbes. Quart. Journ. Geol. Soc, vol. i, p. 240, 



pi. ii, fig. 6. 

 1850. Caedita — A. d'Orbigny. Prodr. de Pal., vol. ii, p. 77. 



1854. Venus J. Morris. Cat. Brit. Foss., ed. 2, p. 230. 



1856. Caedita — F. J. Pidet and E. Benevier. Foss. Terr. Aptieu 



(Mater. Pal. Suisse, ser. 1), p. 82, 



pi. ix, fig. 4. 

 1866. — F. J. Pidet and G. Gampiche. Foss. Terr. Cret. Ste. 



Croix (Mater. Pal. Suisse, ser. 4), 



p. 333. 

 1871. — F. Stoliczlca. Palseont. Iudica, Cret. Fauna S. India, 



vol. iii, p. 287. 



Description. — Shell oval or somewhat rhomboidal, much longer than high, very 

 inequilateral, moderately inflated, but Avith flattened sides. Anterior margin 

 rounded ; ventral margin slightly curved or almost straight, and nearly parallel 

 with the dorsal margin; posterior margin obliquely truncated, forming an acute angle 



1 ' Album Paleont. de la Sarthe' (1867), p. 13, pi. xvi, fig. 3. 



- Owing to the difficulty of distinguishing the fossil forms of Cardita from Venericardia when, as 

 in the case of nearly all the examples found in the Cretaceous rocks of England, the hinge is unknown, 

 all the species are, for the present, referred to Cardita. 



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