british fresh-water extomostraca. 41 



Lyncodaphnidae. 

 Ophryoxus Sars. 

 O. gracilis Sars. 



During a short visit to Fort Augustus last August, in 

 connection with the " Lake Survey " organised by Sir John 

 Murray, K.C.B., I had the good fortune to obtain this species 

 in Loch ISTess, and also in a backwater of the Caledonian Canal, 

 at Coiltry Lock. In the former the species was living in great 

 abundance in the shallow and sheltered bay at Inchnacardoch, 

 near Fort Augustus, and a single specimen was also found on the 

 protected side of the little breakwater belonging to the Monastery 

 at Fort Augustus. I hear from Mr. J. Murray that none were 

 to be taken after September, and that the species has not yet 

 (March) reappeared. At Coiltry only a few specimens were seen. 

 In all cases parthenogenetic females only were observed. 



This species appears to be a characteristic northern form, 

 at least in Europe. It has only hitherto been recorded from 

 Norway, Sweden, Finland, the Kola Peninsula, Greenland, 

 Minnesota, and Wisconsin. Its occurrence therefore in Scotland 

 is particularly interesting. 



Lilljeborg describes and figures it in his usual admirable 

 manner in the Cladocera Sueciae. 



COPEPODA. 



Cyclopidae. 

 Cyclops 0. F. Miiller. 



C. robustus Sars [Lilljeborg (40)]. 



Professor G. S. Brady tells me that he has had specimens 

 of this species from Ennerdale Lake. They were actually taken 

 many years ago, but it is only quite recently that he has definitely 

 made them out to be C. robustus. The species has probably been 

 often included in records of C. vernalis, to which it is very closely 

 allied. 



The following additional records of rare or otherwise interesting- 

 species have been made since the issue of the two previous parts. 



CLADOCERA. 



Diaphanosoma brachyurum (Lievin). A peculiar variety of 

 what appears to be this species, with a strongly projecting fore- 

 head, has been recorded by Mr. Kane from Lough Mask (63, 



