312 MAMMALIA. 



^. With distinctly elongated rostrum generally marked off 

 from the antenarial adipose elevation by a V-shaped 

 groove; the rostral considerably exceeds the cranial 

 portion of the skull in length ; atlas and axis united, 

 other cervical vertebrae free. 



g. Pterygoid bones normal, meeting in the middle 



line. 



h. Palate with deep lateral grooves; symphysis of 



lower jaw short; teeth small not exceeding 



3 mm. in diameter and %% to %% in number. 



Delphinus, p. 321. 



'' ' ^^. Palate not grooved; symphysis of mandible 



short; teeth stout 6 to 7 mm. in antero- 

 posterior diameter, f J to |f in number. 



Tursiops, p. 323. 



h^ , Palate not grooved; symphysis of mandible 

 short ; teeth f§ to \%, small not exceeding 3 

 mm. in diameter. Prodelphinus, p. 324. 



A*. Palate not grooved ; symphysis of the mandi- 

 ble longer than ^th the length of the ramus ; 

 rostrum long and narrow ; teeth |^ to |-|, 

 large 5 to 6 mm. in diameter. 



Steno, p. 324. 



^2. Pterygoid bones narrow, separated in the middle 

 line, their inner borders diverging posteriorly ; 

 teeth •!§ to ff in number, 4 to 5 mm. in dia- 

 meter. Sotalia. p. 325. 



Genus BALAENA. 



Balaena, Linnaus Syst. Nat., 12th ed., i, p. 105 (1766). 



Balaena australis. 



Balsena australis, Desmoulins Diet. Class. H. N., ii, p. 161 (1822) ; Blyth, 

 J. A. S. B., xxviii, p. 488; id. Cat. no. 290, p. 94; Flower P. Z, S., 

 1864, p. 390; id. List Cetacea B. M., p. l. 



The Southern Right Whale. 

 Distribution. — Southern Seas. 



/• fvYrSra ] NohU.<,ry,A.S.B. 



Balaena mysticetus. 



Balaena mysticetus, Linnceus Syst. Nat., 12th ed., i, p. 105 {1766) ; Blyth Cat. 

 no. 289, p. 93 ; Flower P. Z. S., 1864, p.' 390 ; id. List Cetacea B. M., p. i. 



