PEEFACE. 



In the first and second plates of this Seventeenth Decade, detailed 

 figui-es, of the colours of life, are given for the first time of 

 species of three more genera, Lialis, Ajirasia, and Pseiulodehna, 

 of the snake-like group of Lizards so singularly abundant in 

 Australia. 



The third plate gives figures of the colours of life, also for the 

 first time, of one of the magnificently coloured " Parrot Fishes " 

 of our coasts, the Labrichthys laticlavius. 



The fourth plate figures for the first time of the living 

 colours a most beautiful new species of that splendidly coloured 

 group of fishes popularly called " Wrasses " in England, the 

 Heteroscarus Macleayi (McCoy). 



The four following plates illustrate the details of further 

 species of the genus Cellepora^ so important to the geologist 

 investigating om- Tertiary rocks, as well as to the zoologist, from 

 the specimens and descriptions presented by Mr. MacgUlivray. 



Plates 169 and 170 give detailed figures of a new species 

 of Squid, or Cuttlefish (0. Goiddi, McCoy), of the interesting 

 genus Ommastrephes^ having a cone at the end of its internal 

 dorsal pen. 



