of the Fishery Bonn! for Scotland. 



191 



Candona hyalina, B. and R. — This Candona has been Known for a 

 considerable number of years, but there was for a time some uncertainty as 

 to whether it were really distinct, or simply a form of some other species. 

 Now, however, there seems to be little doubt as to its being a "good" 

 species. Candona hyalina was obtained in four of the lochs recently 

 examined— Loch Lomond, Loch Arklet, Loch Katrine, and Loch Doom 



Darwinula stevensoni, B. and R. — This curious and somewhat rate 

 Ostracod was observed in only one loch — viz., Loch Lomond — and was 

 scarce in the only gathering in which it occurred. 



Cytheridea /acustris, G. 0. Sars. — Loch Lomond was one of the tvro 

 lochs in which this species was observed. 0. lacustris has already been 

 recorded for Loch Lomond by Professor G. IS. Brady and the late Dr. 

 Robertson, but it is a species that is not very generally distributed. Its 

 occurrence in Loch Leven has also been previously recorded. 



The Cladocera. — A number of species of Cladocera that are more or 

 less interesting because of their rarity, their restricted distribution, or 

 their remarkable tendency to variation, will now be referred to : — 



Sida crystallinu, Muller. — This fine species was obtained in eight of 

 the lochs examined. 



Diaphanosoma braehyurum, Lievin.— Daphnella — the name by which 

 this Cladoceran was known from Dr. Baird's time on till recent years, is 

 now replaced by the somewhat clumsy appellation of Diaphanosoma. The 

 representatives of this genus, which occurred in two of the lochs 

 examined, appear all to belong to the form previously known as Daphnella 

 brachyura. 



HOLOPEDID/E. 



Holopedium gibberum, Zaddach. — This curious species was observed in 

 five of the lochs, and in all of them it appeared to be more susceptible to 

 seasonal changes than any of the other Entomostracan species. Though 

 common or plentiful in the summer or autumn months, it seemed to 

 disappear entirely during winter. 



1 )aphnid,e. 



Ceriodaphnia laticaudata, P. E. Muller. — This somewhat rare species 

 was obtained in Forfar Loch in a shore gathering, and C. reticulata 

 occurred in the same loch, but in gatherings collected by tow -net. 



Ceriodaphnia quadrangula (O. F. Muller) was observed in tow-net 

 gatherings from Duddingston Loch. Figure 55 on Plate VII. represents 

 one of the Duddingston Loch specimens, and figure 23. Plate XIII., 

 represents the post-abdomen of the same specimen. 



Scapholeberis mucronata, O. F. Muller. — This somewhat rare Cladoceran 

 occurred in two of the lochs examined — the Dhu Loch (close by Loch 

 Lomond) and in Forfar Loch, but it appeared to be somewhat scarce in 

 both of them. 



Daphnice sp. (Plate VIL, figures 1-54.) 

 The Daphnice obtained during the recent investigations have shown in 



