of the Fishery Board for Scotland. 



149 



June ; Daphnia and Bythotrephes were moderately common in the 

 gathering collected at this time with the coarser net, while Diaptomus 

 gracilis was common in that collected with the fine net. Cyclops strenuus 

 and Polyphemus appeared to be more frequent in the upper part of the 

 loch, and Bosmina and Leptodora in the lower part, as shown by the 

 Table. 



It may also be mentioned that Infusoria and diatoms were fairly 

 common in the gathering collected with the coarser tow-net at the upper 

 end of the loch in June, as well as in the fine tow-net. This shows that 

 the coarser tow-net, though more open than the other, was yet fine enough 

 to capture these minute organisms, and therefore the cause of its being 

 less efficient in the capture of Diaptomus than the fine net, is the more 

 perplexing. 



The Shore Fauna Collected by Hand-Net. 



The sides of Loch Katrine do not generally present conditions very 

 favourable to shore-dwellers. An examination of the shore about 

 Stronachlacher yielded scarcely anything that differed from the tow-net 

 captures. The following are the species obtained after a careful examina- 

 tion of a considerable portion of the shore at this place : — Copepoda — 

 Cyclops serrulatus, very few. Cladocera — Bosmina longirostris, Eury- 

 cercus lamellatus, Acroperusharpx, Alonopsis elongatus, Alona ajjinis, and 

 CJiydorus sphwriciis, all of which were scarce. 



At the lower end of Loch Katrine the shore between the Trossachs 

 pier and Ellen's Isle was examined, and yielded much better results than 

 the shore at the upper end. This part of the loch was therefore examined 

 on each of the four occasions when the loch was visited, and a list of the 

 species observed in the four gatherings collected here is contained in the 

 annexed Table. 



[Table. 



