DOLPHINS FROM TRAVANCORE. 733 



elevation, from which four dark faint lines diverge towards the forehead ; 

 ihe inner enclosing a pale lappet-shaped zone which includes the narial 

 aperture, and the outer becoming obsolete halfway up. 

 Eyes dark reddish brown. 

 Lower jow lighter than upper. 

 Lips dull whitish. Fins falcate. 

 Length of skull 16-3 inches ; breadth 7'6 inches. 

 Symphysis much shorter than one-fourth total length of mandible. 



Teeth §f and || = 54 and 53. Simple, conical, and pointed, more or less 

 compressed towards the root ; anteroposterior diameter 6*5 mm. Two teeth 

 in the premasillas, and the first two mandibular ones, which were concealed 

 in the gum, much smaller (diameter 2 mm.). 



In spite of its being a somewhat immature specimen apparently referable 

 to the genus Tursiops, which it resembles in many respects, the pterygoids are 

 widely separated in the middle line, with the posterior border divergent. 

 Vertebras : C. 7, D. 13, L. 15, Ca. 25 = 60. 

 The atlas and axis only fused together. 

 Kibs 13, the first four two-headed. 

 Other characters as in T.fergusoni. 

 From the general characters of the specimen, the number and size of the 

 teeth, the vertebral formula, and the relative shortness of the mandibular 

 symphysis, I cannot but conclude that its reference to Tursiops is correct. It 

 is true that in the divergence of the pterygoids it differs from the typical 

 T. tursio ; but since the same feature occurs in the specimen identified with 

 T. catalania, this affords no grounds for generic separation. 



In the following table are given the dental and vertebral formulas of the 

 Dolphins assigned to the genus Tursiops, inclusive of the present specimens: — 



1. Tursiops tursio (Fabricius). 



Teeth If = 44. 



Vertebras : C. 7, D. 13, L. 17, Ca. 27 = 04. 



Pterygoids in contact. 



2. Tursiops abusalam (PiiippeU). 



Teeth \ § = 52. 



Vertebras : C. 7, D. 12, L. 16, Ca. 20 = 01. 



Pterygoids (?) in contact. 



3. Tursiops sp. (Trevandrum, 1904.) 



Teeth f^ and ^ = 54 and 53. 



Vertebras : C. 7, D. 13, L. 15, Ca. 25 = 00. 



Pterygoids divergent. 



4. Tursiops fergusoni , Lydekker. 



Teeth fi and || = 50 and 51. 

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

 Pterygoids divergent. 

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