f} 
THE BIRDS OF AUSTRALIA. 
The cuts here given show the appearance of the biUs of Th. chlororhynchos 
hassi, Th. chrysostoma cuhninatus, and Th. cautus cautus. The bill of the first- 
named is longer and narrower than that of the second, but the peculiar 
reduction of the culminicorn at its posterior end to a sharp point, distinctly 
and widely separated from the frontal feathering by the fleshy membrane 
Th. chlororhynchos hassi. Th. chrysostoma culmvnatus. 
Th. cautus cautus. 
extending upon it, renders its identiflcation easy. In addition, the base of the 
lower mandible approaches a more perfect fine than the other members, and 
in this resembles Phmhastria. I would consider it subgenerically separable 
from Thalassogeron (s. str.), and propose for this form the subgeneric name 
NEALBATRUS, with type the only species Th. chlororhynchos (Gm.). The bill 
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