Fig. 83—PALAEOZOIC POLYZOA.

A—Fenestella margaritifera, Chapm. Silurian. Near Yering, Vict.
B—Polypora australis, Hinde. Carbopermian. Gascoyne River, Western Australia
C—Rhombopora tenuis, Hinde. Carbopermian. Gascoyne River, Western Australia
D—Protoretepora ampla, Lonsdale sp. Carbopermian. N.S.W.

Cryptostomata (Palaeozoic).—

In the order Cryptostomata we have the genus Rhombopora with its long, slender branches, which occurs in the Silurian of Victoria and the Carbopermian of Queensland and W. Australia ([Fig. 83 C]). Of this order a very important Australian genus is Fenestella, the funnel-shaped zoaria of which are found in the Silurian of Victoria and New South Wales, and also in the Carboniferous of the latter State. Fenestella also occurs in the Carbopermian of W. Australia and Tasmania ([Fig. 83 A]). Accompanying the remains of Fenestella in the Carbopermian rocks, and closely related to it, are found the genera Protoretepora and Polypora ([Fig. 83 B, D]).

Polyzoa have been noticed in Jurassic rocks in W. Australia, but no species have been described.

Fig. 84—CAINOZOIC POLYZOA.

A—Lichenopora australis, MacGillivray. Balcombian. Hamilton, Victoria
B—Heteropora pisiformis, MacGillivray. Janjukian. Moorabool, Victoria
C—Cellaria australis, MacGillivray. Balcombian. Hamilton, Vict.
D—Selenaria cupola, T. Woods sp. Balcombian. Hamilton, Vict.
E—Lepralia elongata, MacGill. Balcombian. Hamilton, Victoria

Cheilostomata (Cretaceous).—