370 Proceedings of the Royal Physical Society. 
Alona quadrangularis (Miller). 
1776. Lynceus quadrangularis, O. F. Miiller, Zool. Dan. Prod., p. 199, 
No. 2393. 
1850. Alona quadranguloris, Baird, Brit. Entom., p. 131, pl. xvi., 
fig. 4. 
This moderately common species was obtained in Raith 
Lake, Camilla Loch, and Lochgelly Loch, Fifeshire; and in 
Loch Leven, Kinross-shire. I have it also from Loch Tay, 
Loch Mullach Corrie, Loch Morar, small lochs in the island 
of Mull, ete. 
Genus Alonella, G. O. Sars. 
Alonella exigua (Lilljeborg). 
1853. Lynceus exiguus, Lilljeborg, De Crust. in Seania occur., p. 79, 
pl. vii., figs. 9, 10. 
21862. Alonella excisa, G. O. Sars, op. cit., p. 52. 
1884. Alonclla exiqua, Herrick, op. cit., p. 105. 
Loch Leven, frequent along the north and south shores. 
T have no record of this species for any other locality within 
the prescribed area. Alonella exigua was obtained in Loch 
Morar, Inverness-shire; and Loch Hempriggs, Caithness- 
shire. 
Alonella nana (Baird). 
1843. Acroperus nanus, Baird, Ann. and Mag. Nat. Hist., vol. ii., 
p. 92, pl. iii., fig. 8. 
1862. Alonella pygmea, G. O. Sars, op. cit., p. 52. 
1884. Alonella pygmea, Herrick, op. cit., p. 105, pl. H., fig. 7. 
Alonella nana has been obtained in two localities within 
the district around Edinburgh, viz., Raith Lake, Kirkcaldy ; 
and Loch Leven. I have <Alonella nana also from Loch 
Morar. This is a very small species, being only about ‘25 
mm. (;35 of an inch); it is therefore easily overlooked. 
Seen under a moderately high power of the microscope, the 
sculpture of the skull of this species is very pretty; it has a 
distinct and more or less regular fluted appearance, the striz 
are obliquely transverse, extending downwards from the 
front in more or less regular curved lines. 
