286 
CRUSTACEA. 
Part II. —Twelfth Annual Report 
The crustacea obtained were not only numerous, especially in the 
bottom material, but included several comparatively rare and interesting 
species. 
1. CopEPoDA. 
Diaptomus gracilis (G. O. Sars). 
Cyclops signatus, Koch. 
,,  strenuus, Fischer. 
» veridis (Jurine). 
»  serrulatus, Fischer. 
»  magnotavus, Cragin. 
5» macrurus, G. O. Sars. 
»  fimbriatus, Fischer. 
Attheyella crassa (G. O. Sars). 
a pygmea (G. O. Sars). 
Frequent. 
Few. 
Few. 
Few. 
Frequent. 
Very rare. 
Rare. 
Frequent. 
Frequent. 
Few. 
2. OSTRACODA. 
Cypria serena, Aoed, J: 
Cyclocypris globosay 2- 0. Sar »)s 
Candona candida. (tletir } 
io lactet. fBecra 
Few. 
Few. 
Few. 
Few. 
3. CLADOCERA. 
Sida crystallina (Miller). 
Daphnia jardini, Baird. 
Bosmina longirostris (Miller). 
Ilyocryptus sordidus (Lievin). 
Acroperus harpe, Baird. 
Eurycercus lamellatus (Miller). 
Camptocercus macrurus Miiller). 
Alonopsis elongata, G. O. Sars. 
Alona quadrangularis (Miller). 
Pleuroxus trigonellus (O. F. Miiller). 
Graptoleberis testudinaria (Fischer). 
Alona guttata (G. O. Sars). 
Chydorus spheericus (Miller). 
Polyphemus pediculus (Linné). 
Bythotrephes longimanus, Leydig. 
Leptodora hyalina, Lilljiborg. 
Scarce. 
Frequent. 
Frequent. 
Rare. 
Few. 
Frequent 
Few. 
Frequent. 
Frequent. 
Scarce. 
Scarce. 
Frequent. 
Frequent. 
Frequent. 
Not com- 
mon. 
Moderately 
frequent. 
I 
| 
z 
| 
in tow-net gather- 
ings. 
in bottom material. 
in tow-net gather- 
ings. 
in bottom material. 
] 
| 
[ 
| 
J 
f in bottom material. 
in surface and 
under-surfacetow- 
net gatherings. 
in bottom material. 
in tow-net gather- 
rings and ~, in 
} bottom material. 
in bottom material. 
in bottom material. 
in ~ surface and 
under - surface 
tow-net  gather- 
ings, 
