PLATE V. 



Osteology of Penguins. 



(All the figures are of the natural size.) 



Fig. 1. — Vertex of skull of Pygosedes tceniatus} 



Fig. 2. — Base of skull of same.' 



Fig. 3. — ^ Vertex of skull of Aptenodytes longirostris. 



Fig. 4. — Base of skull of same. 



^ The skull figured was tliat of a young bird, and the bones not yet being united, the palatal and pterygoid bones 

 had parted and exposed the basi-sphenoidal rostrum. The relation which these bones bear to the rostrum, however, is 

 the same as in other species. 



