90 



COMPARATIVE MORPHOLOGY OF VERTEBRATES 



Fig. 91, — Chondrocraniumof^f«/>AiM»tffl, lateral and dorsal views, aop, antorbital 

 process; a/>, ascending process of quadrate (epipterygoid) ; ct, cornua trabeculae; de, 

 foramen for ductus endolymphaticus; ep, ethmoid plate; fo, fenestra vestibuli; m, 

 Meckel's cartilage; n, notochord; oc, olfactory capsule; ov, occipital vertebrae; ^, para- 

 chordal; g, quadrate; s, stapes; /, trabecula; 2-8, nerve exists. 



Fig. 92. — Skull of aVtegacephalan {Capitosaurns) after Zittell. eo, exoccipital; 

 «/>, epiotic; /, frontal; jM, zygomatic (jugal); la, lacrimal; mx, maxillary; na, nasal; 0, 

 orbit; pa, parietal; pmx, premaxillary; por, postorbital; prf, prefrontal; ptf, postfrontal; 

 qj, quadrato jugal; so, supraoccipital; sq, squamosal; st, supratemporal. 



