SKULL — MAMMALS 



185 



in the orbital tissure) by a separate outgrowth from the trabecula 

 which unites with the orbitosphenoid cartilage. A marginal taenia 

 connects the orbitosphenoid with the otic capsule, and a spheneth- 



Fig. 197. — Chondrocranium of 80 mm. human embryo (Gaupp, "05). ao, ala 

 orbit alis; a/, ala temporalis; c, crista galli; ds, dorsum sellae; e, opening of endolymph 

 duct; fm, foramen magnum; Ic, lamina cribrosa; oc, otic capsule; s, sella turcica; st, 

 svnotic tectum. 



Fig. 198. — Interior of nasal capsule of 23 mm. cat embryo (Terry, '17). e, ethmo- 

 turbinals i and 2; at, anterior transverse process; /, lateral recess; n, naso-turbinal; p, 

 paraseptal cartilage. 



moid bar unites it with the nasal capsule. Both ali- and orbito- 

 sphenoids extend laterally from the trabeculae (the result of the 

 large brain), and no interorbital septum is formed. 



