186 Proceedings of the Royal Physical Society. 



9th April 1901 (Dr and Miss Sprague). As Alonella excisa 

 (Fischer) and A. exigua (Lilljeborg) are retained by Lilljeborg 

 as distinct species, and as the Scottish specimens I have 

 examined belong to Fischer's L. excisus, that name is used 

 here (see remarks in Seventeenth F. B. Bept., pt. iii. p. 201). 



39. Alonella nana (Baird). 



1843. Acroperus nanus, Baird, Ann. and Mag. Nat. Hist., vol. ii. 

 p. 92, pi. iii. fig. 8. 



Habitat. — Upper Elf Loch, Raith Lake, Loch Leven, 

 Loch Katrine, Loch Achray. Mar field Loch (Dr and Miss 

 Sprague). 



Genus (24) Peratacantha, Baird, 1843. 



40. Peratacantha truncata, 0. F. Miiller. 



1785. Lynceus truncatus, Miiller, Entomostraca, p. 75, pi. xi. 

 figs. 4-8. 



Habitat. — Lochgelly Loch, Loch Katrine, Loch Achray, 

 Loch Vennachar, and Loch Lubnaig. High Pond, Penicuik, 

 7th September 1901 ; rare (Dr and Miss Sprague). 



G-enus (25) Pleuroxus, Baird, 1843. 



41. Pleuroxus Imvis, G. O. Sars. 



1861. Pleuroxus loevis, G. O. Sars, Forh. i Vid. Selsk. i Christiania, 

 1861 (Aftr.), p. 22. 



Habitat. — Camilla Loch, Fifeshire ; not common. 



42. Pleuroxus trigonellus (0. F. Miiller). 



1785. Lynceus trigonellus, Mull., Entomostraca, p. 74, pi. x. figs. 5, 6. 



Habitat. — Duddingston Loch, Loch Leven, Eaith Lake, 

 Loch Katrine, Loch Achray. Marfield Loch (Dr and Miss 

 Sprague). 



43. Pleuroxus uncinatus, Baird. 



1850. Pleuroxus uncinatus, Baird, Brit. Entomostraca, p. 135, 

 pi. xvii. fig. 4. 



Habitat. — Eaith Lake and Loch Leven. 



