124 GILL, SYNOPSIS OF THE 



b. Postorbital process and zygomatic process of 

 squamosal connected. Frontal with a little 

 developed ante-orbital tubercle. Maxillary 

 contracted, with a crest and free margin over 

 suborbital region. Pontoporui?^. 



2. Maxillary bones with large bony incurved crests. 

 Teeth without cingulum or tubercles. (Visual 

 organs rudimentary. External respiratory appara- 

 tus longitudinal.) Platanistina'. 



IV. DELPHINID^ Flower. 

 Subfamilies. 



1. Digits with not more than 4-5 phalanges to each. 



a. Cervical vertebrae all distinct. Dklphinapterin^. 



b. Cervical vertebrae more or less (2 to 7) consol- 



idated. Delphinin^. 



2. Digits with numerous phalanges. Globiocephalin^. 



V. ZIPHIID^ Gray. 



Subfamilies. 



I. Maxillaries with no incurved lateral crests. Ziphhnje. 



II. Maxillaries with greatly developed incurved crests. Ananaecin^. 



VI. PHYSETERID^ Gray. 



SUBFAMILIES. 



1. Head very large, truncated in front. Blow-hole near 



the edge of the snout. Cerebral cavity declining 

 downwards. Jugal and zygomatic process of squa- 

 mosal connected. Physeterin^. 



2. Head moderate, conic in front. Blow-hole frontal. 



Cerebral cavity inclining upwards. ' Jugals and 



zygomatic processes of squamosals remote. Koghn^. 



VII. RHABDOSTEID^ Gill. 



MYSTICETE. 



I. Cervical vertebrae separated in whole or in part. 



Digits 4r. BAL^NOPTERID^. (VII.) 



II. Cervical vertebrae coalesced. Digits 5. bal^NID^. (IX.) 



VIII. BAL^NOPTERID^ Gray. 



SUBFAMILIES. 



I. Throat not plicated. Dorsal fin null. Agaphelin^. 



