1908.] 



INDIAN DOLPHIN AND PORPOISE. 



803 



Length of beak from gi-oove wliicli separates 



the forehead 



Length of genital groove 



„ anal groove 



Gape of mouth 



Greatest breadth of body 



,, height of body 



,, circumference in front of dorsal fin . 



Smallest circumference at root of tail 



Height of dorsal fin 



Lene-th from snout to blow-hole 



A. 



B. 



ft. in. 



ft. in. 



U 



5 



7 



8 



2 



3 



1 4 



1 5 



1 6 



1 8 



1 6 



1 8 



3 10 



4 



n- 



1^ 



2 24 



2 3 



1 



1 3 



As regards shape, the body is rather elongate, with a promi- 

 nent ridge extending from the back of the dorsal fin to the 

 middle of the flukes. Both the flippers and the dorsal fin are 

 distinctly falcate. The eyelids are well developed and somewhat 

 mobile ; while the blow-hole is, as usual, placed somewhat to the 

 left of the middle line. In front of the blow-hole is a fatty 

 cushion, marked off from the moderately tapering beak by an 

 ill-defined V-sha]3ed groove. The lower jaw projects somewhat 

 in advance of its fellow. 



The colour of the two specimens is described as follows : — 



A. — UjDper-parts deep glistening black, becoming somewhat 

 lighter below, with a pinkish tinge round the anal and genital 

 apertures ; under side of lower jaw and muzzle dull white. 



B. — Above deep glistening plumbeous black, abruptly passing 

 into pale slaty on the sides ; genital and anal regions lighter ; 

 lips dull white. 



The teeth, which are relatively large, with rugose crowns, 

 number : 



25 , 26 

 21 ^""^ 25 



49 and 51 in A, and 



]^ and 9i> = 47 in B. 



The vertebra?, of which the first two are in each case fused 

 together, number : 



C. 7, D. 12, L. 20, Ca. 25 = 64 in ^, and 

 C. 7, D. 12, L. 17, Ca. 28 = 64 in B. 



The first four pairs of ribs are two-headed. 



The pterygoids are in contact, and the mandibular symphysis 

 is short. 



The phalanges number : 



I. 2, 11. 9, III. 7, IV. 3, V. 2 in J, and 

 I. 3, II, 9, III. 7, lY. 3, Y. 2 in B. 



Both specimens evidently belong to the same species, and from 

 the general contour of the head, body, fin, and flippers, coupled 



