Scottish National Antarctic Expedition : Notes on some Fresh-water Fishes 

 from Buenos Aires. By R. S. Clark, M.A., B.Sc.. Scottish Oceanographical 

 Laboratory, Edinburgh. 



(Handed in July 2, 11J12. Issued separately August 12, 1912.) 



The six fishes here described were brought home by Dr W. S. BRUCE in 1904. 

 They were taken, with one exception, from the Government Dry Dock at Buenos 

 Aires in January 1904, while the Hi.-<>t!n was undergoing repairs there, immediately 

 after her return from her first voyage to the Antarctic. All six have been previously 

 described, though one Plecostomus lnj>/nf;r, Eigenmann only as late as 1907, three 

 years after the capture of the two Scotia specimens. 



The system adopted in describing the species is that outlined by Dr GUNTHER in 

 the British Museum Catalogue ; thefuiidamentum divisionis being the body-length 

 tip of snout to root of middle caudal rays. On account of the considerable variations 

 shown by each species at different stages of its growth, the work of identification has 

 been rendered extremely difficult. In this connection, I tender my grateful thanks to 

 Mr C. TATE REGAN (British Museum) for his invaluable assistance. 



The result of the following investigations has been to corroborate substantially the 

 statement put forward by EIGENMANN in Proc. Wash. Acad. Sciences, to the effect 

 that the fresh-water fish fauna of Buenos Aires is essentially Amazonian. 



The species are : 



SlLURID.K. 



Pimelodus nigribarbis Boulenger. 

 Pimelodus albicam Cuv. and Val. 



LORICARIID.E. 



Plecostomus laplatss Eigenmann. 



CHAUACIDJE. 

 Prochilodus argenteus Agassiz. 



Micropogon uinlti/ittiis Linnajus. 



GYMNOTID^:. 

 Rhamphichthys hlocliit Blocli and Schneider. 



