of the Fishery Board for Scotland, 



163 



Table containing the Names of the Entomostraca Captured tn 



the Tow-Nets. 







Dates. 





Names of the Species. 



1897. 



1 a 



J8. 





Sept. 3. 



Dec. 16. 



March 3. 



<j une 10. 



Copepoua. 











Diaptomus gracilis, G. 0. Sars, 



f. 



fr. 



f. 



f. 



Cyclops strait'. as, Fischer, - 



f. 



f. 



f. 



f. 



Cladocera. 











Daphnia lacusiris, G. 0. Sars, 



very ab. 



ab. 



ab. 



very ab. 



Bytkotrephes longimdnus, Leydig, 



f. 



0 



0 



r. 



Leptodora hyaiina, Lilljeborg, 



c. 



0 



0 



o 



A few male Dapliniw were observed in the December gathering, but in 

 none of the others; females with pseudova were frequent in all the 

 gatherings. When the loch was examined in June 1890 both Daphnella 

 bruchyura and Polyphemus pediculus were observed in the tow-net 

 gatherings, but neither of these species was obtained in any of the 

 gatherings recently collected. Infusoria and micro-alga*, which were 

 moderately frequent on the first three occasions when the loch was 

 examined, were quite abundant in the loch in June; but these minute 

 forms did not appear to be generally diffused. They rather seemed to 

 occur in shoals; they were particularly plentiful to the south of the little 

 island called " Reed Bower." The appearance of the water was somewhat 

 similar to that which was observed at Forfar Loch in September, and at 

 Loch Doon in July. 



The Shore and Bottom Fauna Collected by Hand-Net. 



The examination of the shore yielded, as in the case of the other lochs 

 examined, a much greater number of species than were captured by the 

 tow-nets, but individuals were not nearly so numerous. 

 | ; Fifty-five species of Crustacea were obtained in the shore gatherings 

 collected during the recent experiments. The records of species obtained 

 when the loch was examined in 1890 include some five or six that were 

 not observed in the recent gatherings, and if these and the species cap- 

 tured with the taw-nets be added, they increase the number of crustacean 

 species to sixty-five ; and it is quite probable that even this number will 

 yet be added to when the loch comes to be more thoroughly examined. 



The species recently captured include one Amphipod (Gammarus 

 pulex), and eighteen of each of the three following groups : — The Cope- 

 poda, the Ostracoda, and the Cladocera. The largest number of species 

 of Crustacea obtained in any of the recent shore gatherings from Loch 

 Leven was in that collected on 30th June. This gathering yielded thirty- 

 eight species, or only four less than the total number observed in the 

 tow-net and hand-net gatherings collected in June 1890. The names of 

 all the species observed in the shore gatherings recently collected are 

 contained in the following list ; those collected in 1890 are also added for 

 comparison with the more recent gatherings. 



