Summary. 



This páper deals chiefly with the Freshwater-Am- 

 phipoda colleeted by me during my occasional visit in the 

 Balkán Peninsula. But I am also indebted to several other 

 authors (J. Komárek, A. Mrázek, F. Rambousek, V. Vávra, 

 F. Vejdovský) for the materiál from the samé geographical 

 interesting territory. — The result of my iitudy could de- 

 monstrate, that the fauna of European-especially of Balkan- 

 Amphipoda was not monotonous and that this fauna wan- 

 ted a thorough investigation. 



Of course in this study I was obliged to examine also 

 ^ome of the other forms of the Freshwater — Amphipoda. 

 lam mostgrateful for the eomparative materiál to the authors 

 Mrs. W. E. Sexton, A. Garbini, V. Vávra. 



I. SystematicalPart. 



A. Genus G am marus Fabricius. 



1, Gammarus halcanicus. 



(PÍ. I. 7, text lig. I, 2.) 



The first urosom segment without spines, but with fine 

 setules in 3 groups. Exopodit with a very slender terminál 

 jsegment, with the plumous setae only on the inner margin. 

 Carpo-and proppdit of the 1^^ and 2''^ peraeopod bearing: 

 the spinules only. — L. c? 12'18 mm, Q- 10— J 5 mm. 



These species are living in Montenegro near Šavníei 

 and Kolašín (legit Mrázek 1906). Further in Herce- 

 ^ o v i na (legit Scháfernaj and in Bulgaria near P a n- 

 čerevo-Bystrica, Čerepiški (legit Rambousek) and 

 in the brooks near Karamandža, Pašmaklii, Čepe- 

 lare (legit Komárek). 



Systematically they are near to G. spinicaudatus, and 

 the fine setules on the urosome represent an adap table cha- 

 racteristic. 



