96 XII. Karel Scháfema: 



2. Gammarus hosniacus. 

 (PÍ. I. 9, 9a, text fig. 3, 4, 5). 



Accessory fla^^ellum on the 2^^ antenna I 

 jointed! Basipodit of the 3^'^ — 5*^ peraeopod with many 

 fine setules on the inner surface. The 4*^ peraeopod with 

 rounded epinier. Endopodit of the 3^'^ uropod scarcely half 

 as long as the exopodit. The spines on the urosom in the 

 schéma on page 13. 



These species háve been found by the author with the 

 G. spinicaudatus in the very cold spring of the Bosna 

 river near the watering-place Illidže in Bosnia. 



The one-jointed flagellum on the 2°^ antenna is a 

 characteristic for the G. Guernei, which lives on the Azores. 

 Both are very well separated species and the resemblance- 

 is perhaps a result of tlie convergence. 



3. Gammarus spinicaudatus. 

 (Text fig. G.) 



Eyes large reniform. — Propodit and carpopodit of the- 

 V^ and 2°^ peraeopod with spinules but without long setules. 

 Basipodit of the 5*^ peraeopod of the samé figuře as the 

 preceding one. — Plumose setules only on the inner part of 

 the short endopodit (not more than 3/4 of the exopodit). 

 Endopodit feeble, fringed with very short setules. Telson 

 with narrow and long lobes, with spinules only at the apex. 

 Dorsal spinules on the urosom segments on fig. 6, pag. 15. 



This species lives in the rivers full of stones in M o n t e- 

 n e g r o (leg. Mrázek), in the f ountains of the Bosna river 

 and in very small springs at the base of M o n t e M a g- 

 giore (Istria), in the brook Radobolje, and in the 

 B u n a river near M o s t a r (legit Scháferna) . In the high 

 R h o d o p e Mountains (leg. Rambousek). 



G. spinicaudatus are near the G. Zaddachi Sexton (== G. 

 locusta v. zaddachi Stephensen) and in my opinion they are 

 G. zaddachi also connected with Gammarus locusta, but more- 

 progressed than the G. zaddachi form. 



