62 DELPHINOIDEA. 



Family 8. PLATANISTID^. 



Platanistidae, Gray, I. c. pp. 62, 220 ; Synops. Whales § Dolph. p. 4. 

 Platanistinse, Floioer, Trans. Zool. Soc. vol. vi. p. 114. 



Head long-beaked. Jaws slender, compressed. Skull — crown co- 

 vered with the converging arch and reflexed edges of the maxillaries. 



" Costal cartilages not ossified. The tubercular and capitular 

 articulations of the ribs blending together posteriorly. Cervical 

 vertebrae all free. Pterygoid bones thin, not conforming in their 

 mode of arrangement with either of the other sections. Jaws very 

 long and narrow ; both with numerous teeth having compressed 

 fangs. Symphysis of mandible very long, exceeding half the length 

 of the entire ramus. Orbit very small. Lachrymal bones not di- 

 stinct from the jugal. Pectoral limbs large. Dorsal fin rudi- 

 mentary. Maxillary bones supporting large bony incurved crests. 

 No cingulum or tubercle at the base of the crown of the teeth. 

 Pectoral fins truncated. Visual organs rudimentary. External 

 respiratory aperture longitudinal, linear." — Floioer. 



1. PLATANISTA. 



Platanista, Gray, I. c. p. 221 ; Synops. Whales fy Dolph. p. 4. 



Vertebrae 51 : cervical 7, all separate ; dorsal 11 ; lumbar 8 ; 

 caudal 25. 



1. Platanista gangetica. 



Platanista gangetica, Gray, I. c. p. 223; Synops. Whales 8f Dolph. 

 p. 4. 



Inhab. India, Ganges. 



2. Platanista Indi. 



Platanista Indi, Gray, I. c. p. 224 ; Synops. Whales 8f Dolph. p. 4. 

 Inhab. India, Indus. 



Division II. Nostrils both united into a single central transverse or crescent- 

 shaped blower on the back of the crown (cf. p. 57). 



Suborder V. DELPHINOIDEA. 



Delphinoidea, Gray, Synops. Whales §• Dolph. p. 4. 



Nostrils two, united into a single central transverse or crescentic 

 blower on the back of the crown. Teeth in both jaws, permanent, 

 or rarely deciduous by age. Pectoral fin lanceolate, ovate, or trun- 

 cated. Head generally beaked. Dorsal fin falcate or wanting. 

 Skull beaked ; maxillary bone spread out over the orbit. 



