95 



LXVII. PLATANISTIDAE. 



Genus. 



Platanista Cuv. 



LXVIII. DELPHINIDAE. 



SUB-FAMILIES. 



I. Neck evident externally, the cervical region being attenuated. Frontal 

 area longitudinally expanded an i little depressed. Postorbital process of 

 frontal and zygomatic process of squainosal projecting outwards, and the 

 latter enlarged and directed forwards. Maxillary with a crest and free 

 margin over orbital region. 



PONTOPORIINAE. (A.) 



II. Neck not evident externally, the cervical region not being differentiated. 

 Frontal area abbreviated and declivous. Postorbital process of frontal 

 and zygomatic process of squamosal compressed, and the latter compara- 

 tively short and oblique. Maxillary with no supraorbital crest. 



1. Digits (second and third) not segmented into more than 5-6 pha- 

 langes, each. 



a. Cervical vertebrae all distinct. 



DELPHINAPTERINAE. (B.) 



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



BELPHININAS. (C.) 



2. Digits (second and third) segmented into numerous phalanges. 



QLOBIOCEPHALINAE. (D.) 

 A. PONTOPORIINAE. 



Pontoporia Gtra.y=Stenodelphis Gerv. 



B. DELPHINAPTERINAB. 



Delphinaptcrus Lac., Lillj.= Beluga Gray. 

 Monodon Linn. 



C. DELPHIlflNAE. 



Sotalia Gray. 



Steno Gray. 



Delphinus Linn. 



Cltjmenia Gray. 



Tursiops Gerv.=7m'o Gray. 



Cephalorhynchus F. Cnv.=Eutropia Gray. 



Lagenorliynchus Gray. 



Electro. Gray. Feresa Gray. 



Lucopleurus Gray. Lagenorhynchus Gray. 



Leucorhamphus ~Li\\).-=Delphinapterus Gray (not Lac.) 

 Pseudorca Reinh. 

 Orca Gray 



Orca sensu strict. Ophysia Gray. 



Orcaella Gray. 

 Phoccena Gray. 



Phoccena sensu strict. Acanthodelphis Gray. 



Neomeris Gray. 

 Sagmatias Cope. 



