PLATE IV. 



Osteology of Penguins. 



(All the figures are of the natural size.) 



Fig. 1. — Lateral view of skull of Pygosceles tceniatKS. 

 Fig. 2. — Occiput of skull of same. 



Fig. 3. — Lateral view of skull of Aptenodytes longirostris. 

 Fig. 4. — Occiput of skull of same. 





