S. J. Smith on Brazilian Crustacea. 15 



There are at least three American sj^ecies of Uca : — tlie V. cor- 

 data., described above and the IT. una (the species figured by Guerin 

 and Edwards), from the east coast, and U. Imvis^ the species described 

 and figured by Edwards in the Archives du Museum d'llistoire nat- 

 urelle, tome vii, p. 185, pi. 16, from the west coast. 



The synonymy of these species appears to be in much confusion. 

 The Cancer cordatus of Linne is described at length in the Amoenitates 

 Academicse, and is evidently the species described above and the 

 same as the one figured by Herbst. The description of C. uca in the 

 Systema Naturje is very short and indefinite and no characters are 

 given by which it could be distinguished from the C. cordatus. 



Milne Edwards in his Historie naturelle de Crust., 1837, quotes both 

 these species under his Vca una Latreille ; he gives " I'Amerique 

 meridionale " as the habitat of U. una, and describes a new species, 

 U. Icevis, from " les Antilles." The slight descriptions of his Icevis 

 here given would not distinguish it from the U. cordata. In his re- 

 view of the Ocypodoidea in the Annales des Sciences naturelles, 3"'^ 

 series, tome xx, 1853, these species are again briefly characterized and 

 the same habitas given. In 1854, in the Archives du Museum, loe. cit., 

 he describes U. Iceris at length and figures it, but says, " Je ne con- 

 nais que des individus males de cette espece ; la plupart ont ete rap- 

 portes des environs de Guayaquil, par M. Eydoux." The description 

 and figure here given apply well to specimens in the Museum of Yale 

 College collected at Guayaquil by Mr. Bradley, and distinguish it 

 readily from the Atlantic species. To add to the confusion, Lucas in 

 D'Orbigny's Voyage flans PAmerique meridionale, Crust., p. 23, 1843 

 gives, Avithout description, " Uca una Latr." as coming from " Envi- 

 rons de Guayaquil : M. Eydoux," evidently having the same specimens 

 before him that Edwards has described and figured in the Archives 

 du Museum ! If Edwards' original specimens of Icevis were from the 

 West Indies as stated, they are probably the U. cordata, but, even 

 if this be the case, since the east coast species is evidently the Cancer 

 cordatus of Linne, the name Icevis may be retained for the west coast 

 species to which Edwards's last and fullest description and liis fioure 

 apply. 



White, in the list of Crustacea in the British Museum, p. 31, 1847 

 has " Uca cordata " from the West Indies and Brazil, but quotes as 

 synonyms, Cancer uca and C. cordatus of Linne, C. cordatus of Herbst, 

 and Uca una of Guerin and Edwards, evidently confoundino- the two 

 Atlantic species and intending to restore the older of the Lhmean 

 names. 



