[ 421 ] 



X. On a Collection of Fishes from the Rio Junta, Brazil. 

 By G. A. Boulenger, F.R.S., F.Z.S. 



Eeceived December 8th, 1897, read February 1st, 1898. 



[Plates XXXIX.-XLIL] 



TllE Collection dealt with in this paper, and acquired by the Trustees of the 

 British Museum, was made, in July 1897, by Dr. J. Bach, of La Plata, in the Rio 

 Jurua, an affluent of the Amazons, the Fish-fauna of which had not been previously 

 explored. The list here given will fill up an important gap in our knowledge of the 

 distribution of South-American Fishes. As many as nine new species were 

 discovered by Dr. Bach in the comparatively short time he was able to devote to this 

 exploration. No doubt a more extensive collection in the same river, which I believe 

 it is his intention to make in the near future, if circumstances permit, would 

 result in very numerous additions to this list, which evidently contains but a small 

 proportion of the representatives of this important class of Vertebrates in the Rio 

 Jurua. 



SCI^ENID^E. 



1. Sci^ena amazonica Cast. 



PLEURONECTTD^:. 



2. Solea fischeri Stdr. 



3. SOLEOTALPA PNICOLOR Gthr. 



SILURID^E. 



4. Sorubim LIMA Bl. Schn. 



5. Platystoma juruense, sp. n. (Plate XXXIX.) 



Upper jaw projecting very slightly beyond the lower. Bands of small, equal, 

 villiform teeth in jaws and palate ; vomerine band as broad as pramaxillary, single, 

 notched in the middle, very narrowly separated from the much narrower palatine 

 bands. Depth of body 5f times in total length, length of head 3| times. Head If 

 as long as broad, its greatest width If width of mouth ; fontanelle very small ; eye 



vol. xiv. — part vii. No. 2. — August, 1898. 3 k 



