366 



Crassatellites traili, Hutton (sp.). 



1873. CrassatcUa Iraili, Hutton, Cat. Tert. Moll. N.Z. p. 24. 



Allied to C. dennanti, from which it differs in having a produced 

 (instead of truncated) posterior margin ; and by the fineness of its 

 concentric lineations. 



Dimensions. — Height 32 mm. ; length 45 mm. 



Form, mid Loc. — Miocene : Awaraoa, 'Eaw Zealand. 



L. 10495. Left valve of the adult. Sir James Hector Coll. 



Crassatellites, sp. 



L. 9582. Block of shell conglomerate, containing many fragments 

 of a species of Crassatellites. Post-Pliocene : Flint cliffs, Sharks' 

 Bay, Western Australia. Presented ly W. Saville-Kent, Esq. 



L. 10494. Imperfect left valve of a species allied to C. attenuata. 

 but strongly concentrically ridged. Eocene : Trelissick, Newj 

 Zealand. 



I 



Family CARDIID^. 



Genus CARDIUM, Linnaeus. 

 [Syst. Nat. ed. 10, 1758, p. 678.] 



Shell convex ; umbones elevated, incurved and slightly inclined 

 anteriorly ; right valve having one or two cardinal teeth, two 

 anterior lateral teeth, and one or two posterior lateral teeth ; left 

 valve, two cardinal teeth, one anterior lateral tooth, and one 

 posterior lateral ; ligament external ; surface ornamented by more 

 or less conspicuous radial costae ; pallial line entire. 



Type. — Cardium edule, Linnsus. 



