Land, Fresh-Water, and Marine Crustacea. 183 



lakes throughout the district. I have no record of it from 

 the loch at Duddingston or from any locality in the vicinity 

 of Edinburgh except Marfield Loch, where it was obtained 

 by Dr and Miss Sprague, and in the Union Canal by myself. 



Genus (19) Alona, Baird, 1843. 



27. Alona quadrangular is (0. F. Mtiller). 



1776. Lynceus quadrangular is, 0. F. Miiller, Zool. Dan. Prodr., 



p. 199, No. 2393. 

 1895. Alona costata, T. Scott, Thirteenth F. B. Rept., pt. iii. 



p. 189, pi. v. figs. 2 and 12. 



Habitat. — Loch Achray, Loch Leven, Duddingston Loch, 

 etc. This species appears to be generally distributed and 

 moderately frequent throughout the district. 



28. Alona affinis, Leydig. 



I860. Alona affinis, Leydig, Naturgesch. d. Daphniden, p. 223, 



pi. ix. figs. 68, 69. 

 1895. ,, quadrangular is, T. Scott, loc. cit., p. 1895, pi. v. 



figs. 2, 11, 13, 15, and 25. 



Habitat. — Distribution somewhat similar to that of A. 

 quadrangidaris. 



29. Alona tenuicaudis, G. 0. Sars. 



1862. Alona tenuicaudis, G. 0. Sars, loc. cit., p. 37. 



Habitat. — Camilla Loch, Fifeshire, 1894, not uncommon ; 

 Duddingston Loch, frequent, 1st September 1897, but when 

 this loch was visited three months later the species was not 

 so common. No specimens were observed on 2nd March, 

 but it was again of frequent occurrence in a shore-gathering 

 collected on 15th June 1898. Dr and Miss Sprague found 

 A. tenuicaudis rare in Duddingston Loch on 18th August 

 1900. 



30. Alona costata, G. 0. Sars. 



1862. Alona costata, G. 0. Sars, loc. cit., p. 38. 



Habitat. — Upper Elf Loch, and ditch near Harelaw Dam, 



