Land, Fresh- Water, and Marine Crustacea. 349 



(b) Species with Sixteen-Jointed Antennules. 



215. Cyclops languidus, G. 0. Sars. 



1863. Cyclops languidus, G. 0. Sars, Forhandl. Vidensk.-Selsk. i 



Christiania, p. 249. 

 1901-1902. ,, ,, Drand Miss Sprague, I. c, p. 255, pi. xxxi. 



figs. 1-7. 



Hab. — This species, which was observed for the first time 

 in Scotland in Loch Doon, in Ayrshire, 1 was obtained in a 

 pond near Tynehead, Midlothian, on 30th March 1901 (Dr 

 and Miss Sprague). 



(c) Species with Twelve- Jointed Antennules. 



216. Cyclops serrulatus, Fischer. 



1851. Cyclops serrulatus, Fischer, Bull. Soc. imp. des Natur. 

 Moscou, vol. xxiv. (2) p. 423, pi. x. figs. 22, 23, 26-31. 



Hab. — The Cyclops, generally referred to as " Cyclops ser- 

 rulatus, Fischer," is common in lochs and ponds throughout 

 the district. A form with short furcal joints, which appears 

 to be the var. brachyurus of Cyclops varius, Lilljeborg, has 

 been observed in Duddingston Loch and other places. 

 Another form with the iurcal joints elongated, and which 

 may be the var. speratus of the same species, has also been 

 observed, but they approximate so closely to the species 

 described by Fischer, that I prefer, for the present, to regard 

 them as varieties of that species. 



217. Cyclops macrurus, G. O. Sars. 



1863. Cyclops macrurus, G-. O. Sars, I. c, p. 254. 

 1878. ,, ,, G. S. Brady, Monograph, vol. i. p. Ill, 



pi. xxiv. figs. 1-5. 



Hab. — Loch Vennachar, Loch Katrine, Loch Leven, Black 

 Loch near Loch Glow (Kinross-shire), and Loch Lubnaig. 



1 Cf. Seventeenth Annual Report of the Fishery Board for Scotland, pt. iii. 

 p. 187 (1899). 



