of the Fishery Board for Scotland. Ceol 
1862. Daphnia cucullata, G. O. Sars, Om Crust. Clad. iagttagne i Omegnen af 
Christi. 
1866. Hyalo-daphnia berolinensis, Schodler, Archiv. fiir Naturges., p. 24, pl. ii. 
fies 8 pl. i fie. 15. 
1884, Daphnia cucullata, Herrick, loc. cit., p. 63. 
This is distinguished from other British Daphnids by the head being 
produced upward to a sharp point. 
BosMINID&. 
Bosmina, Baird. 
Bosmina longirostris (Miiller). 
1776. Lynceus longirostris, Miiller, Zool. Dan. Prod., No. 2394. 
1861. Bosmina longirostris, G. O. Sars, Om dei Omegnen af Christi. forekom. - 
Clad., p. 11. 
1867. Bosmina longirostris, Nor. and Brady, Nat. Hist. Trans. of Northumb. 
and Durham, vol. i. p. 357, pl. xxii. fig. 4. 
Thisisasmall species. The anterior antenne are comparatively long and 
curved. It occurs sometimes in considerable abundance. 
Bosmina longispina, Leydig. 
1850. (1) Bosmina longirostris, Baird, Brit. Entom., p. 105, pl. xv. fig. 3 
1860, he longispina, Leydig, Naturges. der Daphn., p. 207, pl. viii. 
fig. 62. 
1867. oe longispina, Nor. and Brady, Joe. cit,, p. 358, pl. xxii. figs. 1, 2. 
This a much larger species than the last, being about double the size. 
The anterior antenn# are not so curved and proportionally stouter; the 
spines of the postero-ventral angle are longer and stouter; the outer or 
convex margin is frequently furnished with two indistinct notches; the 
surface of the carapace is faintly striate longitudinally and sometimes 
reticulate. This appears to be the form described by Baird. The two 
species come very near each other, and may be only forms of one. IT 
found both forms in Loch Balnagowan, Lismore Island. 
LYNCODAPHNIA. 
Ilyocryptus, G. O. Sars. 
Ilyocryptus sordidus (Lievin). 
1858. Acanthocercus sordidus, Lievin. 
1863. Acantholeberis sordidus, Norman, Ann. Nat. Hist., ser. iii. vol. xi. pl. xi. 
figs. 6-9. 
1861. Ilyocryptus sordidus, G. O. Sars, op. cit., p. 12; Andet Bidrag., p, 34 
(1862). 
1867. Ilyocryptus sordidus, Nor. and Brady, loc. cit., p. 368. 
Ilyocryptus is apparentlynot aswimmer. I did not observe any of those 
captured making even an attempt to swim though kept alive for several 
days; but if clumsy in their movements, which consisted of a kind of half- 
crawling, half-tumbling process, they were by no means inactive. Adult 
specimens were usually more or less coated with mud. : 
LYNCEID&. 
Eurycercus, Baird. 
Eurycercus lamellatus (Miiller). 
1776. Lynceus lamellatus, Miiller, Zool. Dan. Prod,, No. 3396. 
1850. Hurycercus lamellatus, Baird, Brit. Entom., p. 124, pl. xv. fig. 1. 
1884, Hurycercus lamellatus, Harrizk Jo cit. DP. 80, pl. H, figs. 5, 6, 
