CRUSTACEA OF NORTHUMBERLAND AND DURHAM 327 



The second species of this genus — if the former is worthy of 

 specific rank — is Diaphanosoma Wingii Baird. Of this the 

 following are, according to Lilljeborg, synonyms : Sidcea 

 crystallina S. Fischer, 185 1 ; Diaphanosoma Leiichtenbergianum 

 S. Fischer, 1854 ; DaphneUa hrachyura G. O. Sars, 1865, 

 Hellich, Daday, and Stengehn ; DaphneUa Brandiiana P. E. 

 Miiller, Herrick, and Matile ; Diaphanosoma bracliyuriim G. 

 O. Sars, 1890; and Diaphanosoma Leuchtenbergianum Lillje- 

 borg, 1 90 1. 



The antennas when directed backwards do not reach the 

 end of the body in D. brachyurum ; in D. Lenciitenbergiamim 

 they attain the length of the body or reach beyond it. 



We have taken Diaphanosomce in Darden Lakes, Northum- 

 berland; and in Wynyard and Hardwick Sedgefield lakes, Co. 

 Durham; but as they were taken some forty years ago we 

 are unable to say positively to which species they belonged ; 

 such specimens as have been preserved appear to be referable 

 to D. brachyurum (A. M. N.) N.D. 



Section IL— ANOMOPODA 

 Fam. I.— DAPHNIID^ 

 Dactylura magna (Strauss). 



1898. Dactylura magna, G. S. Brady, I.e., p. 241, pi. x., 

 figs. 1-8, 18. 

 Pond at Layton Farm, near Sedgefield, Co. Durham 

 (A. M. N.) ; pond at Elstobb House and at Canal Farm, 

 High Barnes, near Sunderland (G. S. B.) ; quarry pond 

 between Plessey and Blagdon, Northumberland (G. S. B. and 

 A. M. N.) N.D. 



Daphnia pulex (De Geer). 



Common in ditches and small ponds. N.D. 



Daphnia obtusa Kurz. 



1898. Daphnia obtusa, G. S. Brady, I.e., p. 224, pi. ix., 

 figs. 5-9. 

 Pond at Bishopton, Co. Durham (A. M. N.) D. 



