CRUSTACEA OF NORTHUMBERLAND AND DURHAM 



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. Lynccns exiginis, 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. Pleuroxns exigmis, Hellich, Die Cladoceren Bohmens, 



P- 99> fig- 57- 

 1900. Alonella exigua, Lilljeborg, Cladocera Sueciae, p. 513, 



pi. Ixxii., figs. 20-26. 

 See under preceding species. 



Alonella nana (Baird). 



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

 fig. 6. 



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

 Christiania forekommende Cladocerer. Forh. Vid.- 

 Selsk. Christiania, 1861, p. 20 (separate copy). 



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

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



1867. Lyncens 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. 



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