SOTALIA GUIANENSIS. 17 



SOTALIA GUIANENSIS (Van IkMiedcii). 



Dclphiinis rjuiaiiciisis, Yau Ben , Morn. Conroii. Acad. Koyale Bclj^., coll. iu &> xvi, 



1864, art. S?, 1 pi. 

 Sotaliit (juianoifih, Graj', Cat. SeaLs and Whali's, IJrit. Miis., ISiiO, p. 401. 



SOTALIA BRASILIENSIS E. Vau Beuedeu. 



Sotalia hrahilicnsis, E. Van Ben., Mcui. Acad. Eoyale Belg , xli, 1875, art. 1, 

 ])ls. 1 and 2. 



SOTALIA PALLIDA (Gcrvais). 



Dflphinus pallidiis, Gorvais, Castelnaa Expdl. dans I'Anidr. Siul, ])t. vii, 



Zuologk', 1855, p. 'J4, pi. XIX, llgs. 1-2. 

 iSotciUajndlUJa, Van Ben. and Gervais,. 0.steog. des C6tacds, 1880, p. 505. 



SOTALIA TUCUXI (Gray). 



Stcno tuciijci, Gray, Ann. and Mag. Nat. Hist., 2d ser.. xviii, 185G, p. 158. 

 SolaVta tuciu'i, Flower, Proc. Zool. Soc. London, 1883, p. 513. 



SOTALIA FLUVIATILIS (Gervai.s). 



DcJpMnm JliiviatiUs, Gcvvais, Bull. Soc. d'Agric. Hdrault, xl, 1853, p. 148 (sine 



clcscr.). 

 Sofalia fluviatilis, Van Ben. and Gervais, Ostdog. des C<Stac6s, 1880, d. 5UG. 



Of these five uoininal species, oue, S. fjnianensis, is from Cayenne; 

 tljree from tlie Amazon River, S. lialUda, tiicuxi, and fluviaUUs ; and 

 one, S. brasiUensis, from the bay of Rio de Janeiro. At least two sl^ele- 

 tons of S. guianensis are to be found in the European collections and 

 one of S. brasiUensis. The latter, however, is that of so young an ani- 

 mal as to make comparisons of little value. The description of iS. 

 tiicuxi was drawn from two skulls in the British Museum. A skull of 

 IS. fiuHatilis is said to be in the Paris Museum,* but is not figured by 

 Van Beneden and Gervais in the Osteographie.t TJiese authors, how- 

 ever, figure and describe portions of a skeleton of S.2)ttUida^ also said 

 to be in the Paris Museum. 



Professor Flower justly remarks that the materials are not at present 

 sufiicient for the proper determination of these species. Nevertheless, 

 several opinions have been advanced regarding them. M. Ed, Van 

 Beneden has brought forward characters which he views as distinguish- 

 ing K brasiUensis £r om S. (juianensis. The authors of the Ostdographie 

 apparently held the same view, and at the same time united S. fliiviatiUs 

 to S. paUida. Gray believed that 8. tncnxi might also be identical 

 with aS. 2)aUida, while Professor Flower finds it diflicult to distinguish 

 between these two species and 8. brasiUensis. 



It is only between 8. gidanensis and 8. &rrt,s«7<'e«s/sthatcomiiarisous of 

 any moment have been made, and the value of these is unfortunately 



*Mdai. Acad. Belg., xlt, 1875, art. 1, p. 4. 



t The references to the figures of SotaVia in this work are very confusing. The legend 

 of platoxn is as follows: " 1-5, S. gnyauensis. G-17, S. pallida," In the " explication 

 des planches," however, all the figures on this plato are placed under the headiug of 

 S. gmjancnsis, while in the text (p. 593) fig. 7 is referred to as S. fluviat'dia. 

 1837S— Bull. 30 2 



