332 CRUSTACEA OF NORTHUMBERLAND AND DURHAM 



Alonopsis elongata G. O. Sars. 



1867. Lynceiis elongatus, Norman and Brady, I.e., p. 374, 



pi. xviii., fig. I, pi. xvi., fig. 2. 



1901. Alonopsis elongata, Lilljeborg, I.e., p. 434, pi. Ixv., 



figs. 5-20. 



This is a lover of moorland lakes and tarns where there is 



some admixture of peat with the water. In Northumberland 



it is widely distributed in such situations, occurring in all the 



Northumberland lakes and many smaller pieces of water. N. 



Alona quadrangularis (O. F. Miiller). 



1867. Ly/iceiis qiiadrangidaris, Norman and Brady, I.e., 



p. 377, Pl- xxi., fig. 5. 

 1867. Alona sanguinea, P. E. Miiller, Danmarks Cladocera, 



Naturhist. Tidsskrift, ser. 3, vol. v., p. 177. 

 1901. Lyncetis quadrangularis, Lilljeborg, I.e., p. 448, 

 pi. Ixvi., figs. 8-17. 

 Common in lakes, ponds, and slow streams. N.D. 



Alona affinis (Leydig). 



i860. Lyncetis affinis, Leydig, Naturgesch. d. Daphniden, 



p. 223, pi. ix., figs. 65-69. 

 1867. Alona oblonga, P. E. Miiller, Danmarks Cladocera, 



Naturhist. Tidsskrift, ser. 3, vol. v., p. 175, pi. iii., 



figs. 22, 23, pi. iv., figs. I, 2. 

 1 90 1. Lyncetis affinis, Lilljeborg, I.e., p. 455, pi. ixvi., 



figs. 18-21, pi. Ixvii., figs. 1-17, pi. Ixviii., fig. i. 



This is Lynceus quadrangularis S. Fischer and Alona 

 quadrangtdaris of Herrick. 



Forge Dam, Sedgefield (A. M. N.); East Belsay Lake 

 (G. S. B.) N.D. 



Alona tenuicaudis G. O. Sars. 



1867. Lynceus tenuicaudis, Norman and Brady, I.e., p. 376, 



pi. xix., fig. 3. 

 1867. Alona tenuicaudis, P. E. Miiller, Danmarks Cladocera, 



Naturhist. Tidssk., ser. 3, vol. v., p. 179, pi. ii., fig. 20, 



pi. iii., fig. 24. 



