188 Proceedings of the Royal Physical Society. 



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

 49. Monospilus dispar, G. O. Sars. 



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



Forhandl., 1861, p. 23. 

 1891. ,, i!emuroA-^m (Fischer), T. Scott, Ninth F. B. Kept, 



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



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

 1897; rare. 



Division GYMNOMERA. 



Tribe Onychopoda, G. O. Sars. 



Family Polyphemid^e. 



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



50. Polyphemus pedicuhis, 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, Leydig, 1860. 



51. Bythotrephes longimanus, Leydig. 



I860. BytJwtrephes longimanus, Leydig, Naturges. der Daphuiden, 

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



Hccbitat. — 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 leucTcarti, G. 0. Sars, Forhaudl. i Vidensk. Selsk. i 

 Christiania, 1861, p. 45. 



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



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



Habitat. — Firth of Forth, occasionally frequent, especially 



