80 



COMPARATIVE ANATOMY 



A 



Tiasocc- 



•58'4*»., 



a«s.i^. 



jiroot fSfh aJ/sjpJt 



pspi 



iasph p\.g„f 



Fig. 61. — A. Cranial Skeleton of Salmon after Removal of the Jaws, 



.iND Orbital and Opercular Bones. (From the right side. ) 



B. Longitudinal section of the same. The cartilaginous parts are dotted. 



vo, vomer ; psph, parasphenoid ; fr, frontal ; ekieth, ectoetlimoid ; socc, supra- 

 occipital ; exocc, exoecipital ; hasocc, basioccipital ; Col. rerl, point of connec- 

 tion of the skull with the vertebral column ; hasph, basisphenoid ; orbsph, 

 orbitosphenoid ; aliph, alisphenoid ; tpiot, epiotic ; pfero, pterotic ; opinth, 

 opisthotic; proot, prootic ; sphot, sphenotic ; -Y.o?/', canal for the olfactory 



the others are, the articular, angular, and coronoid. The last two, 

 however, may be wanting. 



The hyoid arch is followed by four branchial arches and a 

 rudimentary fifth which forms the " inferior pharyngeal bone." 



