20 U.S. NATIONAL MUSEUM BULLETIN 2 46 



S[otalia] tucuxi, Flower, 1884, Proc. Zool. Soc. London, 1883: 513 [classi- 

 fication]. 



Sotalia tucuxi, True, 1889, Bull. U.S. Nat. Mus., 36: 17, 155, pi. 5, fig. 2 

 (skull of type) [taxonomic review; skull in U.S. National Museum 

 said to be from Florida]. — Fraser, in Norman and Fraser, 1938, Giant 

 fishes, whales and dolphins, p. 334 [characters; may be color variety]. 



Sotalia tucuxi or S. fluviatilis, Austen, 1897, Proc. Zool. Soc. London, 

 1896: 771 [Brazil (Parana de Buyassu, channel below Monte Alegre); 

 color; habits]. 



[Steno (Sotalia)] tucuxi, Trouessart, 1898, Cat. Mamm., p. 1027 [classifi- 

 cation]. 



Steno Tucaxi [sic], Van Beneden and Gervais, 1880, Osteographie des 

 Cetaces, p. 595, ftn. 2 [lapsus for tucuxi]. 



Delphinus tuchuschi, Van Beneden and Gervais, 1880, Osteographie des 

 Cetaces, p. 595, ftn. 2 [ms. name attributed to Natterer]. 



Sotalia sp., Layne, 1958, Journ. Mammal., 39: 1, pi. 1 (animal), pi. 2 

 (skull) [Colombia (Leticia, Rio Amazonas); characters; comparisons; 

 variation; habits; fluviatilis, tucuxi, and pallidus probably conspecific]. 



Type: Skin and anterior portion of skull, Museum National d'Histoire 

 Naturelle, Paris. 



Type locality: Rio Marahon above Pebas, Loreto, Peru. 



Distribution : Rio Amazonas and lower parts of its tributaries between 

 the Rio Tocantins, Para, Brazil, and the Rio Huallaga, Loreto, Peru. 



Sotalia guianensis P. J. Van Beneden 



Delphinus Guianensis P. J. Van Beneden, 1864, Mem. Cour. Acad. Roy. 

 Bruxelles, Coll., 16(2): 27, fig. p. 31 (sternum), fig. p. 33 (flipper), fig. 

 p. 34 (ear bone), pi. 2 (skeleton). 



Tursio? Guianensis, Gray, 1866, Cat. seals and whales Brit. Mus., p. 257 

 [British Guiana]. 



Sotalia Guianensis, Gray, 1866, Cat. seals and whales Brit. Mus., p. 401 

 [characters] . 



Delphinus (Sotalia) Guianensis, Van Beneden, 1868, Bull. Acad. Roy. Sci. 

 Belgique, 25: 115 [two cotype skeletons in Louvain Museum]. 



Sotalia guianensis, Gray, 1871, Suppl. Cat. seals and whales Brit. Mus., 

 p. 67 [British Guiana]. — Van Beneden and Gervais, 1880, Osteographie 

 des Cetaces, p. 595, pi. 41, figs. 1-17 (skeleton) [characters; compari- 

 sons].— True, 1889, Bull. U.S. Nat. Mus., 36: 17,155 [review; said 

 to be from Cayenne; distinction from other American Sotalia ques- 

 tioned]. — Beddard, 1900, Book of whales, p. 270 [characters; brasiliensis 

 Van Beneden regarded as a synonym]. — Kukenthal, 1909, Jenaische 

 Zeitschr., 45: 581 [penis of embryo]. — Kukenthal, 1914, Jenaische 

 Zeitschr., 51 : 90, pi. 3b, fig. 37 (animal) [characters].— Williams, 1928, 



