369 



Protocardium serum, Hutton. 



1873. Protocardium serum, Hutton, Cat. Tert. Moll. N.Z. p. 23. 



L. 10577. Two large fragments probably referable to this 

 species. Eoceae : Trelissick, Ifew Zealand. Sir James Hector Coll. 



Family CHAMID^. 



Genus CHAM A, Linnaeus. 

 [Syst. Nat. ed. 10, 1758, p. 691.] 



Shell irregular, inequivalve ; umbones spiral or subspiral, that 

 of the fixed valve always longer than the other; surface ornamented 

 by lamellae or spines, or both ; upper valve operculiform, slightly 

 convex ; lower valve highly convex and much larger ; ligament 

 external; pallial line entire. 



Type. — Chama lazarus, Linnaeus. 



Chama lamellifera, Tenison-Woods. 



1877. Chama lamellifera, Tenison-Woods, Pap. Roy. Soc. Tas. 1876, p. lU. 

 1887. Chama lamellifera, Tate, Trans. Roy. Soc. South Aust. vol. ix. p. 149, 



pi. xiv. figs. ba-b. 

 1893. Chama lamellifera, Tate and Dennant, id. vol. xvii. pt. 1, p. 225. 

 1896. Chama lamellifera, Pritchard, Proc. Roy. Soc. Vict. vol. viii. n.s. 



p. 133. 



Both valves ornamented exteriorly with distant irregular lamellae, 

 occasionally elevated and subspinose ; spaces between having 

 numerous minute concentric striae. 



Dimensions. — Height 17 mm. ; length 21 mm. 



Form, and Loc. — Eocene : Tasmania and Victoria. 



83985. Upper valve ; from Table Cape. Furchased. 



L. 4790. Lower valves, concentric lamellae very irregularly 

 develo])L'd ; from Muddy Creek. Presented hj John Dennant, IHsq. 



L. 6603. Both valves of a typical example ; from Muddy Creek. 



Purchased. 



L. 9836. Examples of the adult; from Muddy Creek. Purchased. 



BB 



