Genus — P RIOCELLA. 
Priocella Hombron and Jacquinot, Comptes Rendus 
Sci., Paris, Vol. XVIII., p. 357, 1844 . . . . . . Type P. antarctica. 
This genus, generally placed alongside Thalassoica close to Puffinus, is to me a 
very near relation of Fuhnarus. In coloration and general features they resemble 
each other, the most apparent difference being in the bills. 
In Priocella the biU is more slender than in Fuhnarus, but it seems to be 
comparable in exactly the same way as the bills of the Prions are. I would 
conclude that Priocella would bear comparison with Fuhnarus exactly as 
Thalassoica would with Daption, and as I shall presently show, the Prions do to 
each other. 
When juveniles of all stages are available I anticipate that, in conjunction 
with the bony internal structure, we will be able to make a definite classification, 
but in view of our knowledge of the Prions I consider the preceding to be a 
more natural attachment than the disposition of these anomalous genera in 
the Monograph. 
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