TABLE OF CONTENTS 



PAGE 



Introduction 7 



I. The Chondrocranium of the 10mm. Larva 8 



Ethmoid region 8 



Orbital region 10 



Otic region 15 



Parachordal region 17 



Occipital region 21 



Maxillary region 25 



II. The Skull of the 32mm. Larva 28 



Ethmoid region 29 



Orbital region 33 



The Parachordals 40 



Otic capsules '. 45 



Occipital region 50 



Maxillary region 52 



Mandibular and suspensorial apparatus 52 



m. The Adult SkulL 54 



Supraethmoid 54 



Ectethmoids 57 



Nasals 60 



Lacrimals 60 



Frontals 62 



Infraorbitals ; 66 



Vomer 69 



Orbitosphenoid 70 



Parasphenoid 72 



Suprasphenoid 74 



Alisphenoids 74 



Sphenotics 77 



Prootics 79 



Squamoso-pterotics 82 



Epiotics 84 



Supraoccipital 86 



Exoccipitals 88 



Basioccipital 90 



Premaxillaries 91 



Maxillaries 91 



Palatines 92 



Ectopterygoid : 92 



Metapterygoid 92 



Quadrate 93 



Hyomandibular 93 



Dentary 93 



Articulare 94 



Preopercular 94 



Subtemporals 94 



Opercular apparatus 95 



