On the other hand, many species have a restricted range, and these are invaluable for purposes of stratigraphical correlation. For example, in the Balcombian we have Modiola praerupta ([Fig. 95 E]), Modiolaria balcombei, Cuna regularis, Cardium cuculloides, Cryptodon mactraeformis, Verticordia pectinata and V. excavata.
A—Modiola pueblensis, Pritchard. Janjukian. Victoria
B—Cardita tasmanica, Tate. Janjukian. Tasmania
C—Lucina planatella, Tate. Janjukian. Tasmania
D—Ostrea manubriata, Tate. Kalimnan. Victoria
E—Limopsis beaumariensis, Chap. Kalimnan. Victoria
F—Venus (Chione) subroborata, Tate sp. Kalimnan. Victoria
Janjukian Bivalves.—
In the Janjukian Series restricted forms of bivalves are exceptionally numerous, amongst them being:—Dimya sigillata, Plicatula ramulosa, Lima polynema, Pecten praecursor, P. eyrei, P. gambierensis, Pinna cordata, Modiola pueblensis ([Fig. 96 A]), Arca dissimilis, Limopsis multiradiata, L. insolita, Leda leptorhyncha, L. crebrecostata, Cardita maudensis, C. tasmanica ([Fig. 96 B]), Cuna radiata, Lepton crassum, Cardium pseudomagnum, Venus (Chione) multitaeniata, Solenocurtus legrandi, Lucina planatella ([Fig. 96 C]), Tellina porrecta and Myodora lamellata.
In Papua a Pecten (P. novaeguineae) has been recorded from the ? Lower Pliocene of Yule Island.
Kalimnan Bivalves.—
The Kalimnan beds contain the following restricted or upward ranging species:—Ostrea arenicola, O. manubriata ([Fig. 96 D]), Pecten antiaustralis (also in the Werrikooian Series), Perna percrassa, Mytilus hamiltonensis, Glycimeris halli, Limopsis beaumariensis (also Werrikooian) ([Fig. 96 E]), Leda crassa (also living), Trigonia howitti, Cardita solida, C. calva (also living), Erycina micans, Meretrix paucirugata, Sunetta gibberula, Venus (Chione) subroborata ([Fig. 96 F]), Donax depressa, Corbula scaphoides (also living), Barnea tiara, Lucina affinis, Tellina albinelloides and Myodora corrugata.
Werrikooian Bivalves.—