1908.] INDIAN DOLPHIN AND PORPOISE. 805 



following external characters of the four definable species of 

 Tui'siojJS included in the above list : — 



1. Tursiops ticrsio. European Seas. 



Size large : 9 ft. 6 in. 

 Upper surface blackish. 

 Undei'-parts white and unspotted. 



2. Tursiops abusalam. Red Sea and Indian Ocean. 



Size smaller: 7 ft. 2i in. (type), 6 ft. 11 in. (India). 

 Upper surface dark greenish. 



Under- parts whitish and spotted with green in adult ;. 

 whitish in young. 



3. Tursiops catalania. IST. Australia to Indian Ocean. 



Syn. (?) T. fergusoni. 



Size about the same as last : 7 ft. 8 in. (type), 7 ft. 4^ in. 



(India). 

 Upper surface dark slate. 

 Under-parts yellowish *, flecked with lead-colour. 



4. Tursiops gllli. N. Pacific to Indian Ocean. 



Size, Indian specimen, 6 ft. 8 in. 



Whole surface blackisli, tending to hghten slightly on the 

 under-parts, with a tinge of reddish in Indian specimens. 



In addition to the above, Mr. F. Lahillet has described 

 (without reference to my paper) a Bottle-nosed Dolphin from the 

 La Plata estuary under the name of Titrsio2)s gephyreus, of which 

 the leading charactei-istics are as follows : — 



Teeth § = 45. 



Yertebrje: C. 7, D. 13, L. 17, Ca. 24 = 61. 



Pterygoids divergent. 



Phalanges : I. 1, II. 7, III. 6, lY. 2, Y. 1. 



Size, large, about 7 ft. 2 inches (276 cm.). 



General colour leaden grey, becoming somewhat lighter on the 

 under-parts ; three or four reddish chicles on the sides in advance 

 of the vent. 



Mr. Lahille considers his Bottle-nose as nearly allied to 

 T. catalania, of which it may indeed be only a large race. In 

 addition to its size and colouring, and slight differences in the 

 number of the teeth and vertebree, it is distinguished by its nar- 

 rower beak and pra^maxillse and much broader temporal region. 



That the new Indian Bottle-nose (PI. XLIY. fig. 1) is quite 

 distinct from T. tursio, T. catalania, and T. abusalam, in all of 

 which the under-parts are light- coloured, is certain. In general 

 colour it agrees much more closely with the Travancore specimen 



* In the type the under-parts are described as whitish ; if the orange tint of the 

 Trevandruni specimens is a specitic character, then the name T. fergusoni will Ije 

 available for the Indian form. 



t An. Mus. Nac. Buenos Aires, ser. 3, vol. ix. p. 347, 1908. 



