. Text book of vertebrate zoology. Vertebrates; Anatomy, Comparative. SKELETON. 153 urodeles, crocodiles, lizards, and many teleosts no such carti- laginous cranial floor is formed, the ventral wall of the skull being formed by membrane bones to be described later. Cartilage walls are also found in the optic and olfactory or- gans. Since motion is necessary in the eye, the optic capsule. aj- y â ⢠ââM} A, â¢A- \* jfly "* 5/ '5 "9 // 8 ^ T" ^Wk 1 [ % ^^^k^ c â '%.''-',^'W'^ vl-V) ^% f Fig. 161. Dorsal and lateral views of the chondrocranium of Amphiuma. anp, antorbital process;
. Text book of vertebrate zoology. Vertebrates; Anatomy, Comparative. SKELETON. 153 urodeles, crocodiles, lizards, and many teleosts no such carti- laginous cranial floor is formed, the ventral wall of the skull being formed by membrane bones to be described later. Cartilage walls are also found in the optic and olfactory or- gans. Since motion is necessary in the eye, the optic capsule. aj- y â ⢠ââM} A, â¢A- \* jfly "* 5/ '5 "9 // 8 ^ T" ^Wk 1 [ % ^^^k^ c â '%.''-',^'W'^ vl-V) ^% f Fig. 161. Dorsal and lateral views of the chondrocranium of Amphiuma. anp, antorbital process; ap, ascending process of quadrate; c', cornu trabeculse; e, ethmoid plate; ef, foramen for ductus endolymphaticus; j, jugular foramen; /, lamina cribrosa; ?«, Meckel's cartilage; n, notochord ; of, foramen for oculomotor nerve; ocp, occipital process (vertebra); of, foramen for optic nerve; /, para- chordal; pal, foramen for palatine nerve; pf, foramen for ductus perilymphaticus; q, quadrate ; s, stapes; sp, stapedial process of quadrate; t, trabecula; Ire, trabecular crest; V, VII, VIII, foramina for V, VII, and VIII nerves. (sclerotic, p. 83) never participates in the formation of the cra- nium. The nasal capsules, on the other hand, unite with the anterior ends of the trabeculse and with the cornua. They are frequently extensively fenestrated. In the vertebrate series a general law may be observed. The more completely the adult skull is ossified, the less developed is the 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 Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
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