. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. Nasal Capsule" Pterygoquadrate "^C°rbit Otic Capsule ^V" of Neurocranium^ ..-.â .-/ .-"Hyomandibularâ /T) Spiracle u_-âQuadrate Region^' ^-Meckel's Cartilage^ Ceratohyal"""~. HYOSTYLIC SKULL OF SCYLLIUM Fig. 480. Diagrams of an amphistylic skull (a and b) and hyostylic skull (c and n). a and c are left-side views; b and d, posterior views of left half. (After Goodrich.) The craniostylic type of skull, found only i
. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. Nasal Capsule" Pterygoquadrate "^C°rbit Otic Capsule ^V" of Neurocranium^ ..-.â .-/ .-"Hyomandibularâ /T) Spiracle u_-âQuadrate Region^' ^-Meckel's Cartilage^ Ceratohyal"""~. HYOSTYLIC SKULL OF SCYLLIUM Fig. 480. Diagrams of an amphistylic skull (a and b) and hyostylic skull (c and n). a and c are left-side views; b and d, posterior views of left half. (After Goodrich.) The craniostylic type of skull, found only in the mammals, is a modifi- cation of the autostylic type in that the upper jaw articulates directly with other skull elements without any hyomandibular participation. But in the mammals the articular and quadrate bones become transformed into middle ear ossicles (malleus and incus, respectively), while the jaw articulation is taken over for the first time by two pairs of investing bones, the dentaries of the lower jaw and the squamosals of the upper jaw. 4. Comparative Anatomy of the Skull Bones According to Gregory there may be as many as 180 bones in the skulls of some of the primitive fishes. In amphibia and reptiles the number ranges. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Walter, Herbert Eugene, b. 1867; Sayles, Leonard Perkins, 1902-. New York : Macmillan Co.
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