U. S. NATIONAL MUSEUM 



BULLETIN 36, PL. V 



Fig. 1. Sotalia fluviatilis (Gervais). 



(From Castelnau. Expedition dans TAmerique du Sud, p!, 7, Zoologie, lL5b, pi. 9, fig. 1.) 



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Fig. 2. Sotalia tucuxi Gray. 



(From a photograph of the type-skull. No. 1 189a, cf . in the British Museum.) 



Genus SOTALIA. 



