COMPARATIVE ANATOMY 

 B 



IV 



FIG. 75. A, DORSAL, B, VENTRAL, C, LATERAL VIEW OF SKULL OF 



annulatus. 



Ap, external nostril ; any, angular ; Car, carotid foramen ; Ch, internal nostril ; 

 Co, occipital condyle : dent, dentary ; DK, apertures for ducts of tentacular 

 gland ; E, ethmoid region ; F, frontal ; M, maxilla ; Npr, naso-premaxilla ; 

 Orb, orbit ; Pal, palatine ; Po, petroso-occipital ; Pp. Pp', palatine process 

 of the naso-premaxilla and of the maxilla ; P,s, parasphenoid, united 

 posteriorly with the auditory and occipital elements ; Pt, pterygoid ; Qu, 

 quadrate; Sq, paraquadrate (" squamosal ") ; Sfp, stapedial plate ; Vo, 

 vomer ; X, vagus foramen. 



D, Hyobranchial apparatus of the larva of Ichthyophis ylutinom. After 

 P. and F. 8arasin.); Co 1, 2, first and second basal elements (copula;) ; //, 

 * hyoid ; I IV, branchial arches, 



