THE ENTOMOSTRACA OF LAKE BASSENTHWAITE. 129 



Bassenthwaite in April, but very abundant and universally distributed 

 at the surface and some little distance below the surface in June, with 

 eggs, embryos, and larva? in all stages of development. 



Copepoda. 

 Cyclops signatus, Koch. 

 Cyclops signatus, Brady, Brit. Copep. vol. i. p. 100, pi. xvii. figs. 4—12 ; id. 

 Revision Brit. Freshwater Cyclopidfe and Calanidfe, p. 6, pi. ii. fig. 5. 



Examples with serrated and with simple ridge on antenna were 

 taken. They are supposed to represent different stages in development 

 (Herrich). This species is widely distributed and common in Britain. 



Cyclops strenuus, Fischer. 



Cyclops strenuus, Brady, Brit. Copep. vol. i. p. 104 ; id. Rev. Brit. Freshw. 

 Cyc. and Cal, p. 8, pi. ii. 



"Widely and generally distributed in Britain, but not very common. 



Cyclops Thcmasi, Forbes. 

 Cyclops Thomasi, Brady, Freshw. Cyc. and Cal. p. 15, pi. vi. figs. 1 — 4. 



This is not a common species. Scott has taken it in many of the 

 Scottish lakes, but it seems to occur nowhere in great abundance. It 

 was rare in Bassenthwaite in April, this being the first time that it has 

 been recorded from the English lakes. No specimens were taken in 

 June. 



Cyclops insignis, Glaus. 



Cyclops insignis, Brady, Brit. Copep. vol. i. p. 108, pi. xxi. ; id. Rev. Brit. 

 Freshw. Cyc. and Cal. p. 18, pi. vii. 



Brady describes it as being one of the less common species of Cyclops. 

 I have not found it recorded from the Scottish lakes. Specimens of 

 this species Avere fairly common in the middle of the lake in April, but 

 rare in June. (I am inclined to believe now that this species is not 

 distinct from C. Thomasi. Nov. 20, 1899.) 



Cyclops Eivarti, Brady. 

 Cyclops Ewarti, Brady, Rev. Brit. Freshw. Cyc. and Cal. p. 22. 

 Scott has taken this species in a small bay near Queensferry, Firth 

 of Forth. Brady remarks that this is the only undoubted member of 

 this genus which has been found living in the sea. As it was first 

 i 



