Cainozoic Bivalves.—
In Victoria, South Australia, and the N.W. of Tasmania, as well as in New Zealand, Cainozoic marine beds are well developed, and contain an extensive bivalved molluscan fauna. Of these fossils only a few common and striking examples can here be noticed, on account of the limits of the present work.
The commonest genera are:—Ostrea, Placunanomia, Dimya, Spondylus, Lima, Pecten, Arca, Barbatia, Plagiarca, Cucullaea, Glycimeris, Limopsis, Nucula, Leda, Trigonia, Cardita, Cuna, Crassatellites, Cardium, Protocardium, Chama, Meretrix, Venus (Chione), Dosinea, Gari, Mactra, Corbula, Lucina, Tellina, Semele and Myodora.
A—Dimya dissimilis, Tate. Balcombian. Victoria
B—Spondylus pseudoradula, McCoy. Balcombian. Victoria
C—Pecten polymorphoides, Zittel. Janjukian. South Australia
D—Leda vagans, Tate. Janjukian. South Australia
E—Modiola praerupta, Pritchard. Balcombian. Victoria
Persistent Species.—
To mention a few species of persistent range, from Balcombian to Kalimnan, we may cite the following from the Cainozoic of southern Australia:—Dimya dissimilis ([Fig. 95 A]), Spondylus pseudoradula ([Fig. 95 B]), Lima (Limatula) jeffreysiana, Pecten polymorphoides (found also in the Oamaru Series, New Zealand) ([Fig. 95 C]), Amusium zitteli (found also in both the Waimangaroa and Oamaru Series of New Zealand), Barbatia celleporacea, Cucullaea corioensis, Limopsis maccoyi, Nucula tenisoni, Leda vagans ([Fig. 95 D]), Corbula ephamilla and Myodora tenuilirata.
Balcombian Bivalves.—