PEEFACE. 



The first plate in this Eighteenth Decade represents a newly- 

 discovered, third species of Blue-tongued Lizard, Cyclodus 

 occipitalis, very rare in Victoria, the only examples I have seen 

 being from the North-Western District ; remarkable for the 

 great number and size of the occipital plates on the back part 

 of the head. 



The second plate shows one of the largest and most con- 

 spicuously coloured of our food fishes, the true Yellow-Tail, 

 Seriola Lalandi. 



The third and fourth plates show two ot the many varieties 

 of another of our large and often beautifully-coloured food 

 fishes, the Chilodactylus carponemus, not figured of the natviral 

 tints before. 



The next four plates continue our illustrations of Victorian 

 Polyzoa, through the kindness of Mr. MacGillivray, whose ex- 

 tensive collection is given with the descriptions for the National 

 Museum and this work. 



