1. STENO. 65 



Tribe I. STENONINA. 



Stenonina, Gray, Synops. Whales fy Dolph. p. 5. 

 Head beaked, teeth conical. Beak of the skull elongate, slender, 

 compressed. Nasal triangle short. Symphysis of the lower jaw 

 elongate. 



1. STENO. 



Steno, Gray, Cat. Seals fy Whales, pp. 230, 232, 393, 394 ; Synops. 

 Whales 8f Dolph. p. 5. 



Beak of the skull compressed, higher than broad. Symphysis of 

 the lower jaw long. Marine and fluviatile. " Pectoral fin moderately 

 long, triangular, obtusely pointed at the end. First digit short, 

 without any bony phalange ; the second with six, the third five, 

 the fourth two, and the fifth one phalange. The carpal bones all 

 separated by broad cartilages. Scapula oblique, truncated at the 

 posterior angle. Acromion broad, and coracoid rather small." — 

 Flower. 



a. Skull large, solid; the beak compressed, high. 



* Teeth large, conical, about two in an inch of the length of the margin 

 of the jaw. 



1. Steno frontatus. B.M. 



Steno frontatus, Gray, 1. c. p. 233. n. 3 ; Synops. Whales fy Dolph. p. 5, 

 t. 21. f. 7, 8. 



Beak of the skull short ; the front part thick, high, and blunt. 

 Teeth 24 . 24, large, two in an inch. 

 Inhab. Indian Ocean. 



2. Steno compressus. B.M. 



Steno compressus, Gray, I. c. p. 233. u. 4 ; Synops. Whales 4" Dolph. 

 p. 5, t. 27. 



Beak of the skull elongate, compressed, attenuated in front. Teeth 

 26 . 26, large, two in an inch (Zool. E. & T. t. 27). 

 Inhab. South Sea. 

 Steno rostratus appears to belong to this section. 



* * Teeth three in an inch. 



3. Steno chinensis. 



Delphinus chinensis, Osbeck's China ; Gray, Cat. S. fy W. p. 266. 

 Delphinus sinensis, Desmarest, Mam. p. 514 ; Flower, Trans. Zool. 

 Soc. vol. vii. p. 151, t. 17, 18 (skeleton). 



Vertebras 51 :— C. 7. D. 12. L. 10. C. 22. 

 Inhab. China, Canton (Osbeck), Formosa (Swinhoe). 



