9 6 



PISCES 



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

 Teleostei (p. 437). 



na. 



hh. 



Fig. 5S. 

 Skull iaws and hyoid arch of A, Heterodontus (Cestracion) PhUvppi, Lac; and B, Salmo 

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

 articulation; eh, epihyal (stylohyal); hh. hypohyal; Tim, hyomandibulai ■; 1. labial; „,/,. 

 Meckel's cartilage ; m, nasal capsule ; n.e, nasal cartilage ; p, palato-quadrate ; pe. prespnacular : 

 pi, palatine re-ion ; q, quadrate region ; /, trabecula. A dotted ring indicates the spiraclelin A. 



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

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



