PLATES AND EXPLANATIONS. 
The negatives from which Plates I-V are reproduced, and the negatives of sections, 
represented in Plates VI-1X, were taken at the Australian Museum by Mr. 
H. Barnes, Junr., and Mr. Thomas Whitelegge, respectively. As now represented, 
Plates I-V were reproduced by Mr. A. E. Dyer, and Plates VI-IX lithographed 
by Mr. E. W. Minchin, at the Government Printing Office, Sydney, under the 
direction of Mr. W. A. Gullick, Government Printer. 
PLATE I. 
Maly sites cratus, Eth. Jil. 
Fig. 1. A large corallum, longitudinal aspect, exhibiting the large autopores, gonopores, and 
mesopores. 
Halysites lithostrotonoides, Eth. Jil. 
Fig. 2. Corallum seen from above, exhibiting the pavement-like form of the fenestrules. 
Fig. 3. A larger corallum, longitudinal aspect, exhibiting the comparatively even sides of the 
fenestrules. 
