PREFACE. 



This twelfth Decade gives illustrations in the first plate of two 

 varieties and the young of the commonest of the Lizards found 

 near Melbourne, the Grammatophora muricata, absurdly called 

 "Blood-sucker" by the colonists. 



The second plate gives the detailed illustrations of the parts 

 of the Antarctic representative of those curious fish, so interesting 

 to geologists, the Chimcerce ; this species, the Callorhynchus 

 Antarcticus being often called Elephant Fish by the fishermen. 



The third plate is devoted to details of both sexes of that 

 famous and most peculiar Shark, the Port Jackson Shark or 

 Cestracion, the Heterodontus Phillipi, the teeth of which 

 resemble many ancient fossil forms found in the Palaeozoic 

 Rocks of Europe, which would be inexplicable but for the 

 existence in our day of this Australian type, in the opinion 

 of many authorities, who see a nearer affinity than I do. 



The Fish figured on the fourth plate, the Trachichthys 

 Australis, is so rare that the type specimen in the British 

 Museum, imperfectly described eighty years ago, has remained 

 unique until Count Castelnau and myself each recently obtained 

 an example, enabling me now to give a careful figure from 

 the fresh specimen. 



