"Typical Skull of Common Fowl (Galliformes). A, side view: sa, surangular bone of mandible; ar, articular…
"Typical Skull of Common Fowl (Galliformes). B, vertical longitudinal section: sa, surangular bone of…
"Cartilaginous Cranium of the Pike (Esox lucius), with its intrinsic ossifications. A, top view; 3,…
"Cartilaginous Cranium of the Pike (Esox lucius), with its intrinsic ossifications. B, side view: V,…
"Saurognathous skull of woodpecker (Colaptes auratus). v, v, the posterior parts of the abortive vomer;…