808 ON AN INDIAN DOLPHIN AND POEPOISE. [KoV. 3,. 



inwards and enamelled, and the sides compressed with the base 

 expanded. Pterygoids narrow, sepai-ated from each other in the 

 middle line, with their inner border divergent posteriorly. 



Palati]ies somewhat W-shaped, with the median suture extend- 

 ing nearly halfway between the widely separated pterygoids. 



Kibs 12 pairs ; six pairs double-headed. 



Vertebra? : C. 7, D. 12, L. 9, Ca. 23 = 51. The first two 

 cervical vertebrae are united, but the epiphyses are not fused with 

 the centra of the vertebra?. Symphysis of the mandible one-third 

 the length of the ramus. 



Phalanges : I. 1, II. 7, III. 6, IV. 3, V. 2. 



There can be no doubt from this description and the figure that 

 this Dolphin is referable to the genus Soialia, as redefined by 

 myself in the ' Journal of the Bombay Natural History Society,' 

 vol. XV. pp. 412 & 413, 1903*. It is equally evident that it is 

 identical with the Speckled Dolphin [Sotcdia lentiginosa t) ; and 

 this beiug so, it is apparent that the young Trevandrum Dolphin, 

 named and figured by myself in the paper just cited as Sotcdia 

 fergusoni (pi. D) cannot (as I suggested might prove to be the 

 case) be separated from ,S'. lentiginosa, the absence of spotting 

 being a feature of immaturity. 



The present specimen renders necessary the following slightly 

 amended definition of Sotcdia : — 



Teeth medium, smooth, and numerous (26-35). 



Pterygoids separate. 



Palatines W-shaped, with a long symphysis below the 



pterygoids. 

 Vertebrae 49-55. 



In aS'. lentiginosa the number of the teeth in the adult may now 



be given as oi — ot^ = 68 or 72 ; and that of the vertebrse as 



C. 7, D_. 11 or 12, L. 10 or 9, Ca. 21 or 23 = 49 or 51. At. 

 least this is, I think, the best way of harmonising the vertebral 

 formula of the^ present specimen with that of the type of: 

 *S'. fergusoni. 



EXPLANATION OF THE PLATES. 



Plate XLIV. 



Fig. 1. Twrsiops datvsoni. j\j nat. size. 

 Fig. 2. Neophoccena sp. About \ nat. size. 



Both from the neighbourhood of Trevandrum. 



Plate XLV. 



Sotalia lentiginosa. 



From the neighbourhood of Trevandrum. 



* In the figure on p. 414 the lettering ^a?. Aw&pt. shoukl be transposed., 

 t = Steno Untiginosus Blanford. 



