9 6 



PISCES 



developed in at least two cases, i.e. the Holocephali and the 

 Teleostei (p. 437). 



ea. 



ncu. 



nc 



cfo. 



ink. 



hh,. 



Fie. 58. 



Skull, jaws, and hyoid arch of A, Heterodontus (Cestracion) Philippi, Lac. ; and B, Sabno 

 (after Parker, modified), a, auditory capsule ; bh, basihyal ; ch, ceratohyal ; e.a, ethmoid 

 articulation; eh, epihyal (stylohyal) ; hh, hypohyal ; hm, hyomandibular ; I, labial; ink; 

 Meckel's cartilage ; na, nasal capsule ; n.c, nasal cartilage ; p, palato-quadrate ; pc, prespiracular ; 

 pi, palatine region ; q, quadrate region ; t, trabecula. A dotted ring indicates the spiracle in A. 



To grasp the full significance of Huxley's comparisons of these 

 various modes of attachment of the jaws, we must briefly refer 



