CRUSTACEA OF NORTHUMBERLAND AND DURHAM 337 



localities were given in our paper of 1867. Probably most of 

 them, if not all, apply to the present species, with which 

 Alonella exigua Lilljeborg was united by us. The differences 

 between the two species according to Lilljeborg's recent work 

 appear to be very slight. The illustrations given by us in 

 1867 are regarded by Lilljeborg as referable to A. exigua; 

 but we do not now know in what locality the figured specimen 

 was taken. N. 



Alonella exigua (S. Fischer). 



1853. Lynceus exiguus, Lilljeborg, De Crust, ex Ord. tribus, 



&c., p. 79, pi. vii., figs. 9, 10. 

 1874. Alonella exigua, Kurz, Dodekas neuer Cladoceren, 



p. 58, pi. iii., fig. 2. 

 1877. Fleuroxus exiguus, Hellich, Die Cladoceren Bohmens, 



P- 99, fig- 57- 



1900. Alonella exigiia, Lilljeborg, Cladocera Suecise, p. 513, 

 pi. Ixxii., figs. 20-26. 



See under preceding species. 



Alonella nana (Baird). 



1850. Acropertis nanus, Baird, Brit. Entom., p. 130, pi. xvi., 

 fig. 6. 



1 86 1. Alona pygmcea, G. O. Sars, Om de i omegnen af 

 Christiania forekommende Cladoceren Forh. Vid.- 

 Selsk. Christiania, 186 1, p. 20 (separate copy). 



1863. Pleuroxus transversus, Schodler, Neue Beit. z. 

 Naturgesch. d. Cladoceren, p. 50, pi. iii., figs. 52, 53. 



1867. Lynceus nanus, Norman and Brady, I.e., p. 396, 

 pi. xviii., fig. 8, pi. xxi., fig. 8. 



1901. Alonella nana, Lilljeborg, I.e., p. 517, pi. Ixxii., 

 figs. 27-31. 



Greenley, Sweethope, Darden, and Capheaton lakes ; 

 Winter's Stob ; Aird, in Northumberland ; Hardwick Lake, 

 Sedgefield (A. M. N.) ; Wallington, Rothley, and Belsay; 

 Fardingslake near Marsden (G. S. B.) N.D. 



