ON TWO DOLPHINS FROM MADRAS. 411 



In regard to the occurrence of bottle-nosed porpoises other than the 

 typical Tursiops tursio in Indian waters, Dr. Blanford wrote as follows 

 in his volume on the Mammalia in the " Fauna of British India " : — 



" It is highly probable that either Tursiops catalania described from 

 N.-W. Australia, or the closely allied T. abusalam inhabiting the 

 Red Sea, is also found in the neighbourhood of India. The two may 

 be identical. Both are smaller than T. tursio and have dark spots on 

 the lower surface." 



The present specimen (assuming my identification to be correct) not 

 only converts this suggestion into a certainty, but serves to show that 

 T. catalania (of which the vertebral formula is now for the first time 

 ascertained) is perfectly distinct from the Red Sea species. The accom- 

 panying plate (C) shows, I believe, for the first time, the external 

 characters and colouration of the Australian species, which is now proved 

 to range to India. In the figure the missing portions of the back-fin 

 and flukes have been restored. 



FERGUSON'S DOLPHIN (SOTALIA FERGUSONI). 



Plate D. 



Of the second specimen, which was obtained on March 31st and is, 

 quite young, the following description was supplied by the Museum : — 



Extreme length 



Length from tip of beak to origin of back-fin 



>) >f >> >> >> >> >y >> nipper 



„ „ „ „ „ „ „ „ anal apertur< 



Length of flipper along front curve 



„ ,, back-tin „ „ „ 



Expanse of flukes 



Greatest girth ... 



Height of back-fin 



" Lower jaw not projecting. A V-shaped groove at the base of the 

 prenarial fatty cushion. 



" Body fusiform, rounded anteriorly, triangular in the middle and 

 compressed towards the tail. Tail above and below with a prominent 

 convex ridge marked ofT from the back-fin and abdomen by a concave 

 outline. 



" Colour, above dull black, sides paler, beneath dull white. 

 " Teeth, §§ or ff. 



