95 



LXVII. PLATANISTIDAE. 



Genus. 



Piataniitu 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 squamosal 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 vertebrre all distinct. 



DELPHINAPTERINAE. (B.) 



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



DELPHININAE. (C> 



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



GLOBIOCEPHALINAB. (D.) 

 A. PONTOPORIINAE. 



Pontoporia Gray=StenodeIphis Gerv. 



B. DELPHINAPTERINAE. 



Dflphinaptcrus Lac, Li\lj.-= Beluga Gray. 

 Monodon Linn. 



C. DELPHININAE. 



S'ttalia Gray. 



Steno Gray. 



1 >■ Iphinus Linn. 



Clymenla Gray. 



Tursiops Gerv. ^Tursio Gray. 



Cephalorkynchus F. Cuv.=Eutropia Gray. 



Ijiigenorhynchus Gray. 



Electra Gray. Feresa Gray. 



Lucopletvus Gray. Lagenorhynchus Gray. 



Leucorhamphus JAllj.=DelpJiinapterus Gray (not Lac.) 

 Pseudorca Reinh. 

 Orca Gray 



Orra sensu strict. Ophysia Gray. 



OrcaeUa Gray. 

 Phoccerta Gray. 



Phoacna sensu strict. Acanthodelphis Gray. 



Ncomrrts Gray. 

 Sagmatias Cope. 



