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LXVII. PLATANISTIDAE. 
Genus. 
Platanista Cuv. 
LXVIII. DELPHINIDAE. 
: SUB-FAMILIES. 
I, Neck evident externally, the cervical region being attenuated. Frontal 
area longitudinally expanded and 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. 
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 vertebra all distinct. 
b. Cervical vertebre more or less (2 to 7) consolidated. 
DELPHINAPTERINAE. 
(A.) 
(B.) 
DELPHININAE., (C.) 
2. Digits (second and third) segmented into numerous phalanges. 
GLOBIOCEPHALINAE. 
A. PONTOPORIINAE, 
Pontoporia Gray=Stenodelphis Gerv. 
B, DELPHINAPTERINAE, 
Delphinapterus Lac., Lillj.=Geluga Gray. 
Monodon Linn. 
Cc. DELPHININAE. 
Sotalia Gray. 
Steno Gray. 
Delphinus Linn. 
Clymenia Gray. 
Tursiops Gerv.=Tursio Gray. 
Cephalorhynchus F. Cuv.==Lutropia Gray. 
Lagenorhynchus Gray. 
Electra Gray. Feresa Gray. 
Lucopleurus Gray. Lagenorhynchus Gray. 
Leucorhamphus Lillj.=Delphinapterus Gray (not Lac.) 
Pseudorca Reinh. 
Orca Gray 
Orca sensu strict. . Ophysia Gray. 
Orcaella Gray. 
Phocena Gray. 
Phocena sensu strict. Acanthodelphis Gray. 
Neomeris Gray. 
Sagmatias Cope. 
(D.) 
