8 THE AMERICAN CHARACIDAE. 



Allen, on account of his health, was compelled to leave the Expedition. St. John 

 followed the San Francisco to Villa do Barra then went by land through the 

 valley of the Rio Grande, a tributary of the San Francisco to Santa Rita, "thence 

 to Mocambo and across the table-land separating the basin of the Rio San 

 Francisco from that of the Rio Paranahyba." He collected in the Basin of the 

 Rio Paranahyba at Paranagua, Manga, San Goncallo, and Therezina. Near 

 the latter place he collected in the Rio Poty or Puty a tributary of the Rio 

 Paranahyba. From Therezina he crossed the divide to Caxias on the Itapicuru 

 which empties into the ocean at Maranham. 1 He reached the latter place on 

 January 8, 1866. 



The collection of fresh-water fishes made by Louis Agassiz and his assist- 

 ants is the largest ever brought together by a single expedition. The hope 

 of Agassiz to complete the work on the fishes was not realized, the very wealth 

 of material making a comprehensive report almost herculean. Dr. Franz 

 Steindachner, Hofrat and Intendant of the K. K. Naturhistorisches Hofmuseum, 

 Wien, who has written extensively concerning the collections made by Natterer, 

 obtained leave of absence from May 1870 until June 1873. During this time 

 he accompanied Professor Agassiz on the Hassler Expedition, December 1871 

 to August 1872, and devoted more than two years to the study of the fishes 

 secured during the Thayer Expedition which he considered "without any 

 exaggeration the richest and most complete in the world." 



The following papers are based wholly or in part on the Thayer Brazilian 

 collection : 



Agassiz, Louis and Mrs. E. C. A journey in Brazil. Boston, 1868. 

 Eigenmann, C. H. The evolution of the catfishes. Zoe, 1890, 1, p. 10-15. 



On the presence of an operculum in the Aspredinidae. Amer. nat, 1892, 26, 



p. 71. 



Steindachneria. Amer. nat., 1S97," 31, p. 158-159. 



New genera of South American freshwater fishes, and new names for some old 



genera. Smith, misc. coll., 1903, 45, p. 144-148. 

 Eigenmann, C. H. and R. S. A list of the American species of Gobiidae and Callionymidae, 



with notes on the specimens contained in the Museum of Comparative Zoology, 



at Cambridge, Massachusetts. Proc. Cal. acad. of sci., 1888, ser. 2, 1, p. 51-7S. 



American Nematognathi. Amer. nat., 1888, 22, p. 647-649. 



Preliminary notes on South American Nematognathi, I. Proc. Cal. acad. 



sci., 1888, ser. 2, 1, p. 119-172. 



Preliminary descriptions of new species and genera of Characinidae. West 



Amer. sci., 1889, 6, p. 7-8. 



1 There is another river Itapicuru emptying into the ocean between the bay of Bahia and the mouth 

 of the San Francisco, in which Dr. Haseman made extensive collections, (p. 10). 



