22 



BULLETIN 36, UNITED STATES NATIONAL MUSEUM. 



So far as external appearances arc concerned there are apparently 

 few points of resemblance between the two species. The depression 

 and great extent of the dorsal fin, so slrongly insisted upon by Puclieran 

 as a cliaracter of S. lilumhca., is not shared by S. kntiginosa, and tiie 

 measurements do not agree. The color of the body of S. phtmhea is 

 described by F. Cuvier as being of "une teinte nniforme d'un gris 

 plombe, excepte I'extremite et le dessous dc la machoire inferieure, 

 qui sout blanchfitres."* The color of ^S'. lentiginosa, according to Pro- 

 fessor Owen, is "pretty uniformly bluisli cinereous, or slaty, freckled 

 with irregular small spots or streaks of brown or plumbeous pigment, 

 the streaks longitudinal and flecked with white ; the under surface is a 

 shade lighter than the rest of the body."t 



I think we may look upon t.lie two species as distinct, and do not 

 fear that future evidence will invalidate this conclusion. 



Tabic of mcasitrcmcnts of llic h/pe-sl^nll of Sotalia plunibea. 



* MaTntiiif(>res do la Menagorio du Museum, CO" livrasioii. {Fide Pucberan.) 

 t Trans. Zool. Soc, London, vi, 1808, p. 20. 

 I Collected by Dussumier, 1837. 



