804 ME. T!. LYDEKKER ON AN [NoV. 3,. 



with the number of vertebi-fe and teeth, the large size of the 

 latter, the presence of four pairs of double-headed ribs, and the 

 approximation of the pterygoids, there can be little hesitation in 

 referi'ing that species to the genus Titrsioj^s. 



As regards comparison, I think it will simplify matters to 

 reproduce, with some slight modification, the synopsis of the 

 species of the genus given in my above-mentioned paper in the 

 Society's ' Proceedings' for 1905 : — 



1. Tursicqys tursio. 



Type sj)ecimen : Teeth "^ = 44. 



Yertebrte: C. 7, D. 13, L. 17, Ca. 27 = 64. 

 Pterygoids in contact. 



2. Tursiops ahusalam. 



Type specimen : Teeth .^ . = 52. 



Vertebrae : C. 7, D f2, L. 16, Ca. 26 = 61. 

 Pterygoids (?) in contact. 



Indian specimen : Teeth ^ and ",„ = 54 and 53. 



Yertebrc^: C. 7, D. is", L. 15*", Ca. 25 = 60. 

 Pterygoids divergent. 



3. Tursiops catalania. 



Type specimen : Teeth ^l = 50. 



Yertebrfe : C. 7, D. {2, L. 15, Ca. 24 = 58. 

 Pterygoids divergent (?). 



Indian specimen* : Teeth %. and i^;. = 50 and 51. 



Yertebraj: C. 7, D. 13, "l. 17, Ca. 24= 61. 

 Pterygoids divergent. 



4. Tursio2)s parvimanus. 



Teeth II = 49. 

 Yertebrpe = 62. 



Type specimen : Teeth ^ and ^^ = 44 and 45. 



5. Tursiops gilli. 

 ype specin 

 Yertebrse (?). 

 Indian specimen : Teeth 7j^ and ^? = 55 and 53, or (in 

 young) - and ^^ = 49 and 50. 



Yertebrpe: C. 7, D. 12, L. 16, Ca. 23 = 58. 

 pterygoids divergent. 



If the foregoing identifications be correct, we shall have the 



* Turf'iops fergusoni, Lj-dekker. 



