188 Proceedings of the Royal Physical Society. 



Genus (27) Monospilus, G. 0. Sars, 1861. 

 49. Monospilus dispar, G. 0. Sars. 



1861. Monospilus dispar, G. 0. Sars, Vid. Selsk. i Christiania 



Forhandl., 1861, p. 23. 

 1891. ,, tenuirostris (Fischer), T. Scott, Ninth F. B. Kept., 



pt. iii. pp. 272 and 295, pi. v. fig. 1. 



Hahitat. — Loch Leven, 1890; Loch Achray, November 

 1897; rare. 



Division GYMNOMERA. 



Tribe Onychopoda, G. 0. Sars. 



Family PolyphemidvE. 



Genus (28) Polyphemus, 0. F. Muller, 1776. 



50. Polyphemus pediculus, Linne. 



1761. Monoculus pediculus, Linn., Fauna Suecica, p. 498, No. 2048. 



Habitat. — Loch Leven, 1890; Loch Lubnaig, 1894; Loch 

 Vennachar, Raith Lake. 



Genus (29) Bythotrephes, Ley dig, 1860. 



51. Bythotrephes longimanus, Ley dig. 



1860. Bythotrephes longimanus, Leydig, Naturges. der Daphuiden, 

 p. 244, pi. x. figs. 73-75. 



Habitat. — Loch Leven, 1890; Loch Vennachar (1895), 

 Loch Katrine, and Loch Achray. Not uncommon in the 

 larger lochs. 



Genus (30) Podon, Lilljeborg, 1853. 

 (The members of this genus and the next are marine.) 



52. Podon Leuckarti, G. 0. Sars. 



1862. Pleopis leuckarti, G. 0. Sars, Forhandl. i Vidensk. Selsk. i 



Christiania, 1861, p. 45. 



1902. „ ,, T. Scott, Twentieth F. B. Rept., pt. iii. 



p. 476, pi. xxv. figs. 23 and 24. 



Habitat. — Firth of Forth, occasionally frequent, especially 



