Jurassic bivalved molluscs are plentiful in the W. Australian limestones, as at Greenough River. Amongst others may be mentioned _Cucullaea semistriata_, _Ostrea_, _Gryphaea_, _Trigonia moorei_ (Fig. 93 D), _Pecten cinctus_, _Ctenostreon pectiniforme_ and _Astarte cliftoni_ (Fig. 93 E). Several of the species found are identical with European Jurassic fossils. Jurassic strata in Victoria, being of a freshwater and lacustrine nature, yield only species of _Unio_, as _U. dacombei_, and _U. stirlingi_. The Jurassic beds of S. Australia contain a species of _Unio_ named _U. eyrensis_. In the same strata which contains this shell, plant remains are found, as _Cladophlebis_ and _Thinnfeldia_, two well-known types of Jurassic ferns. =Lower Cretaceous Bivalves.--= In Queensland the Lower Cretaceous limestones and marls contain a large assemblage of bivalves, the more important of which are _Nucula truncata_ (Fig. 94 A), _Maccoyella reflecta_ (Fig. 94 B), _M. barkleyi_, _Pecten socialis_ and _Fissilunula clarkei_ (Fig. 94 C), from Wollumbilla; and _Inoceramus pernoides_, _I. carsoni_ and _Aucella hughendenensis_ from the Flinders River (the latter also from New South Wales). In the Lake Eyre District of S. Australia we find _Maccoyella barkleyi_, which also occurs in Queensland and New South Wales (at White Cliffs), _Trigonia cinctuta_, _Mytilus rugocostatus_ and _Modiola eyrensis_. The handsome bivalve, _Pleuromya plana_ occurs near Broome in W. Australia. [Illustration: =Fig. 94--CRETACEOUS BIVALVES.= A--Nucula truncata, Moore. L. Cretaceous. South Australia B--Maccoyella reflecta, Moore sp. Up. and L. Cretaceous. Q'land. C--Fissilunula clarkei, Moore sp. Up. and L. Cretaceous. Q'land. D--Inoceramus carsoni, McCoy. L. Cretaceous. Queensland E--Cyrenopsis opallites, Eth. fil. Up. Cretaceous. New South Wales F--Conchothyra parasitica, Hutton. Cretaceous. New Zealand ] =Upper Cretaceous Bivalves.--= The Upper Cretaceous or Desert Sandstone at Maryborough, Queensland, has yielded amongst others, the following shells:--(_Nucula gigantea_, _Maccoyella reflecta_ also found in the Lower Cretaceous of Queensland, New South Wales and S. Australia), and _Fissilunula clarkei_ (also found in the L. Cretaceous of New South Wales, Queensland and S. Australia). Some of these beds, however, which were hitherto believed to belong to the Upper and Lower Series respectively may yet prove to be on one horizon--the Lower Cretaceous. _Cyrenopsis opallites_ (Fig. 94 E) of White Cliffs, New South Wales, appears to be a truly restricted Upper Cretaceous species. The Cretaceous of New Zealand (Amuri System) contains _Trigonia sulcata_, _Inoceramus_ sp. and the curious, contorted shell, _Conchothyra parasitica_ (Fig. 94 F) which is related to _Pugnellus_, a form usually considered as a sub-genus of _Strombus_. From Papua an _Inoceramus_ has been recorded from probable Cretaceous beds. =Cainozoic Bivalves.--=