Land, Fresh- Water, and Marine Crustacea. 181 



not rare in the larger lakes, where both species are sometimes 

 found living together. They are both variable species, and a 

 number of varieties have been described. 



Family Lyncodaphnid^, G. O. Sars. 

 Genus (10) Ilyocryptus, G. 0. Sars, 1861. 



18. Ilyocryptus sordidus (Lievin). 



1848. Acanthocercus sordidus, Lievin, Die Branchiopoden d. Danziger 

 Gegend; Neueste Schrift. d. Naturf. Gesell. in Danzig, 

 4 :ten Bds. 2 : tes Heft. p. 34, pi. viii. figs. 7-12. 



Habitat. — Lochend Loch, Edinburgh, Loch Leven; Lin- 

 lithgow Loch, and Loch Achray; not uncommon. Upper 

 Elf Loch, Edinburgh (Dr and Miss Sprague). 



Genus (11) Macrothrix, Baird. 



19. Macrothrix laticornis (J urine). 



1820. Monoculus laticornis, Jurine, Hist, des Monocles, p. 151, 



pi. XV. figs. 6, 7. 

 1901. Macrothrix laticornis, Dr and Miss Sprague, Trans. Edin. Field 



Nat. and Micros. Soc, vol. iv. p. 258, pi. xxxa. figs. 13-15. 



Habitat. — Pond in Queen's Park, Edinburgh, 16th June 

 1900; rare (Dr and Miss Sprague). 



Genus (12) Lathonura, Lilljeborg, 1853. 



20. Lathonura rectirost^^is, 0. F. Miiller. 



1785. Daphnia rectirostris, 0. F. Miiller, Entomostraca, etc., 

 p. 92, pi. xii. figs. 1-3. 



Habitat. — Loch Achray, Trossachs, November 1897; rare. 



Genus (13) Drepanothrix, G. 0. Sars, 1861. 



21. Drepanothrix dentata (H. A. Euren). 



1861. Acantholeberis dentata, Euren, Ofvers af K. Wet.-Akad. Forh. 

 (1861), No. 3, p. 118, pi. iii. fig. 2. 



Habitat. — Loch Lubnaig, Loch Katrine, and Loch Achray. 



