CRUSTACEA OF NORTHUMBERLAND AND DURHAM 



Peracantiia truncata (O. F. Miiller). 



1903. Peratacantha tnincata, Lilljeborg, I.e., p. 522, 

 pi. Ixxiii., figs. r-20. 



Lilljeborg has changed Pcracantha into the more classical 

 form Feratacait/a, but if changes like this were allowed to be 

 made where would they stop ! 



Greenley and Crag lakes, Northumberland, and Wynyard 

 and Hardwick (Sedgefield) lakes, and a pond at Bishop 

 Middleham (A. M. N.) ; Ryton-on-Tyne, Cleadon Farm pond, 

 and Axwell Park (G. S. B.) N.D. 



Pleuroxus L/Evis G. O. Sars. 



1 86 1. Lynceus Levis, Norman and Brady, I.e., p. 3S9, 



pi. xviii., fig. 5, and pi. xxi., fig. 14. 

 1901. Pleu7-oxus hcvis, Lilljeborg, I.e., p. 529, pi. Ixxiii., 

 figs. 21, 22, and pi. Ixxiv., figs. 1-5. 

 Crag Lake, Northumberland, and Hell Kettles, near 

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



Pleuroxus aduncus (Jurine). 



1867. Lynceus trigonellus, Norman and Brady, I.e., p. 391, 



pi. xxi., fig. II. 

 1901. Lynceus aduncus, Lilljeborg, I.e., p. 541, pi. Ixxv., 



figs. 11-17. 



Crag Lake, Holy Island, Hardwick Lake Sedgefield (A.M.N.) 



N.D. 

 Pleuroxus trigonellus (O. F. Miiller). 



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



Naturgesch. d. Cladoceren, p. 44, pi. ii., figs. 33-36. 

 1863. Pleuroxus ornaius, id. ibid, p. 47, pi. ii., fig. 32. 

 1874. Pleuroxus trigonellus, Kurz, Dodekas neuer 



Cladoceren, &c., p. 67 (separate copy), pi. iii., 



figs. 2-5. 

 1901. Pleuroxus trigonellus, Lilljeborg, I.e., p. 534, pi. Ixxiv., 



figs. 13-23- 

 The Forge Dam, Sedgefield (A. M. N.); pond near Sunder- 

 land Cemetery, Hesleden Engine Pond near Seahani (Ci. S. B.) 

 We question whether this and the preceding should bu 

 regarded as more than varieties. 1). 



89 



