38 A REVISION OF THE BRITISH SPECIES OF 



the species. It was also taken many years ago (1867) by my 

 friend Mr. David Robertson, E.L.S., in a pond near the North 

 Loch at Lerwick, N.B., but the capture has remained until 

 now unnoticed in print. Lilljeborg's specimens (D. serricomis) 

 were taken in fresh-water lakes at Lumbowski, in Russian 

 Lapland, — peninsula of Kola — on the 11th of August, 1877. 

 The type-specimens of D. Wierzejshii were from the neighbour- 

 hood of Madrid and Yalladolid ; and it has more recently been 

 taken abundantly at Zorbig, near Halle, in Saxony, by M. 0. 

 Schmeil. 



I am quite unable to recognize any valid specific distinction 

 between D. serricomis, Lilljeborg, and D. Wierzejshii, Richard. 

 The number of serratures on the male antennal appendage is 

 stated to be seven or eight in one form and about twelve in the 

 other, but in the Scottish gatherings the number is very vari- 

 able. As regards the fifth pair of feet of the male, I find that 

 my drawing made from a Sutherlandshire specimen (PI. IX., 

 fig. 5) agrees almost exactly, even down to the peculiar shape 

 of the hyaline laminae, with De Guerne and Richard's figure of 

 the same organ in D. Wierzejshii ; but the Sutherland specimens 

 have in almost every case only about seven or eight antennal 

 serratures, in this respect agreeing with the typical D. serri- 

 comis. I have only in one or two cases been able to make 

 out the ciliated bosses described and figured by De Guerne and 

 Richard, as well as in this paper (PL IX., figs. 9, 10), but it is 

 extremely difficult to get a good view of these minute structures, 

 the parts of the limb being very apt to become mixed and to 

 overlap one another. 



Genus EURYTEMORA, Giesbrecht. 



(= Temorella, Clans.) 



A subdivision of the old genus Temora, Baird, was proposed 



almost simultaneously in 1881 by two authors, Drs. Claus and 



Giesbrecht, the latter having apparently a slight advantage of 



priority. Giesbrecht, however, made his divisions sub-generic 



only, while Claus, retaining the name Temora for one group, 



assigned to his second group the generic name Temorella. In 



103 



