472 Miss Edith M. Pratt on the 



(see Map, p. 475). Very few mature specimens were taken 

 at the surface, or at the depth of 2 to 4 feet ; but from 6 to 

 10 feet (10 feet = greatest depth at which tow-nettings were 

 taken) it was taken in great quantities. 



Btjthotrephes longimanus, Ley dig. 



BythotrepJies longimanus, Leydig, Naturgeschiehte der Daplmiden, 

 p. 24-4, rigs. 73-75, Taf. x. 



British Habitat. — Scotland (Scott) : Loch Ness, Loch 

 ^lorar (frequent at surface), Loch Leven (frequent). Perth- 

 shire Lochs (Sej)t.) : Loch Oich (common), Loch Tay (frequent 

 at surface). 



This species has not been recorded before from the English 

 lakes. In Bassenthwaite it was very rare in April but very 

 abundant in June, with eggs, embryos, larvse, and young. 



Beck describes the species " cederstromii " from Grasmere 

 and other English lakes, and remarks that it appears to be 

 more abundant in the autumn than in the spring. 



Daphnia pulex } Latreille. 



Daphnia pulex, Baird, Brit. Entom. p. 89, tab. xvi. fig. 5. 



This species, while being widely distributed in ponds and 

 ditches in Britain, occurs but rarely in large sheets of water ; 

 it was very rare in Bassenthwaite in April, and no specimens 

 were taken in June. 



Daphnia longispina. 



Daphnia louyispina, Baird, Brit. Entom. p. 91, tab. vii. figs. 3,4. 



This species was taken by Beck in the English lakes and 

 by Scott in some of the Scottish lochs. It was rare in April, 

 and no specimens were taken in June. 



Polyphemus pedicidus, Straus. 



Polyphemus pediadus, Baird, Brit. Entom. p. Ill, tab. xvii. fig. 1; 



Leydig, Naturg. der Dapbuiden, p. 232, Taf. viii. fig. 63, Taf. ix. 



fig. 71. 

 Baird took specimens of this species in a ditch near Rich- 

 mond on Thames; he remarks that this species seems to be 

 very limited in its range of habitat, as he only found it in 

 one spot not more than 20 yards in extent. Scott, however, 

 has taken it in many of the Scottish lakes, and describes it as 

 being a fairly common species, especially in large sheets of 

 water ; in Loch Morar, in Perthshire, it was taken by him in 



