of the Fishery Board for Scotland. 



167 







Dates. 





Names of the Species. 



1897. 



1898. 





Dec. 15. 



March 2. 



June 15. 



Sept. 16. 



Isopoda. 











Asellus aquaticus, (Linn.) 



r. 



0 



0 



0 



COPEPODA. 











Diaptomus gracilis, G. 0. gars, - 



{lite! niriQ E/y^nv4/o T^tc^Ii^*. 



\j tfiAVjJo on c/cttUd) r iscner, - 



f. (c. in 

 fiviG not. ) 

 fr. 



f. 

 fr. 



f. (c. in 

 fine net. ) 

 f. 



fr. (in 

 footli nets. ) 

 fr. 



, , vwidvs (Junne), - 

 , , albidus (Jurine), - 



f. 

 f. 



0 

 f. 



r. (in fine 

 ne i. j 

 r. 



0 

 f. 



ttheyella pygtiuca (G. 0. Sfirs) 



• 



r. 

 r. 



0 

 0 



0 

 0 



f. (in fine 

 net.) 

 0 



OsTRACODA. 











Cyclocyprxs sere net (Koch), - 



r. 



0 



f. (in fine 



0 



Cypris pubera, Miiller, 



r. 



u 



net. ) 



V) 



n 



Herpetocypris replans (Baird), 



0 



0 



0 



f. 



P ionocypris vidua (Miiller) 



0 



0 



0 



f. 



Cladocera. 











Ceriodaphnia quadrangvla (Miiller), - 

 Daphnia lacustris, G. 0. Sars, 

 Eurycercus lamellatus (Miiller), - 



0 



ab. (a few 

 eph. f'mls.) 



0 

 c. 

 0 



0 



ab. (a few 

 males.) 

 0 



f. (males 



rare. ) 

 c. (a few 

 males.) 

 fr. 



Chydorus splmricus (Miiller), 



0 



0 



0 



r. (in fine 

 net.) 



It will be observed that Daphnia is the most abundant of all the 

 Crustacea captured in the tow-nets; Diaptomus and Cyclops strenuus are 

 also moderately common. These, along with Cyclops albidus, occurred in 

 all the four gatherings, and none of them appear to have been much 

 affected in their distribution by the changes incidental to the different 

 seasons of the year. A few male Daphnia were obtained in the gather- 

 ings collected in June and September, and they were also probably 

 present in the December gathering, though they did not happen to be 

 noticed ; for in that gathering there were a number of ephippial females, 

 and where such forms are observed I frequently also find that males are 

 present. Moreover, here, as in the other lochs, Diaptomus gracilis was 

 more plentiful in the gatherings collected with the fine net than in the 

 others. 



The Invertebrate Fauna obtained by Hand-Net chiefly around the Shore. 



The following Table contains the names of all the species of Crustacea 

 obtained by hand-net around the shores of Duddingston Loch during the 

 different visits that have been made to it, inclusive of the one made in 



