SOTALIA PLUMBEA. 



Measure mcnta of iltrcv ^liiJIs of Sotalia iuciixi. 



21 



* Collected by Bates. 



t The maxilla; have sprung apart. 



SOTALIA PLUMBEA (Ciivier). 



Delphiiius 2)htmhcHs, Cuvier, Kogiie Auimal, 2(1 ed., i, 1829, p. 283; PucLorau, Rev. 



ct Mag. do ZooL, 2dsor., Vili, 185G, pp. 145, 315, 362, 449. 

 Sotalia i)himhcus, Flower, Proc. Zoo], Soc. Loudon, 1883, 11. 513. 

 Sleno plumhcKS aiict. 



In the elaborate critique upon the relationships of this species pub- 

 lishetl by Piicheran in 185G, the evidence upon which it was united to 

 1). malai/anus, Lesson, D. duhius, Cuvier, and other species, was veiy 

 carefully sifted and the conclusion arrived at that it must be considered 

 distinct and valid. 



In its proportions and general appearance the type skull (^3053) 

 resembles that of S. lentiginosa, but the diflereuces are such that it can 

 not be united with that form, at least upon the basis of the i^resent 

 scanty material. '-'■ Delpliinus lAunibcus^ Dnssumier/' writes Professor 

 Flower, "represents tlie longest and narrowest form of this type, with 

 the most numerous teeth." (Characters and Divisions, p. 489). The 

 beak is longer and more compressed than in 8. lenti^hwsri, and the brain- 

 case is decidedly narrower. 



