British Freshioater Ilarpactlds, 195 



This species was obtained for the first time in Scotland in 

 a shore-gathering collected in Loch Vennachar, Perthshire, 

 and afterwards in shore-gatherings collected in Loch Doon, 

 Ayrshire, in December 1897, and in Loch of Park, Aberdeen- 

 shire, in 1899. I do not know of any other station for this 

 species in Britain. 



Besides the Harpactids mentioned in the foregoing notes,. 

 all of which, with one or two exceptions, are usually confined 

 to freshwater localities, there are a considerable number that 

 find a habitat in our brackish-water estuaries, ponds, and 

 marshes ; and though these for the most part belong to the 

 same subfamily as those already noticed, they include also 

 representatives of nearly all the subfamilies into which the 

 riarpacticidaj have been divided. And while the Cantho- 

 camptinge comprise most, if not all, the British freshwater 

 Harpactids, the majority of the species belong to the genus 

 Canthocamptus^ and are, with few exceptions, all freshwater 

 species. But Canthocamptus hirticornis, though found in 

 fresh water, occurs also occasionally in water that is slightly 

 brackish ; Canthocamptus palustris, as has been already men- 

 tioned, is usually found in places within the influence of the 

 tide ; Canthocamptus parvus, T. & A. Scott, and Cantho- 

 camptus propinquus, T. Scott, are, on the other hand, marine 

 species, and for that reason have been excluded from the 

 preceding notes. C. propinquus has been obtained in the 

 Moray Firth and the Firth of Forth, and appears to be 

 moderately rare ; C. parvus appears to be more generally 

 distributed ; the antennules of these two species are composed 

 of six joints instead of eight or nine, but otherwise there is 

 nothing to distinguish them from typical freshwater species. 

 For these and other reasons the line dividing the freshwater 

 species from brackish -water forms, and these again from 

 marine, is at best somewhat arbitrary. 



Additional Note. 



After the preceding notes had been forwarded to the 

 printers I received a letter from my kind friend the Rev. A. M. 

 Norman, in which he refers, among other things, to the two 

 freshwater Harpactids Canthocamptus staphyliaus (Jurine) 

 and Canthocamptus minutus, Claus ; and as his remarks on 

 these two species should be of interest to students of the 

 freshwater Copepoda, I have, with his permission, transcribed 

 them here. 



Referring to Canthocamptus staphylinuSj he says : — " 0. F. 



