276 
HISTORY OF BRITISH CRUSTACEA. 
Gen. 147. EVADNE, Loven. 
Head not distinct from the body; abdomen short, scarcely 
projecting from the shell. 
Evadne Nordmanni, Loven. (Plate XVI. fig. 3.) — Nearly 
colourless, except the back part of the eye, which is black. 
Hab. Pirth of Eorth. The late Mr. Goodsir, who perished 
in the Arctic regions, on the unfortunate Franklin expedi- 
tion, first found this species in the British seas. It is very 
active, and forms part of the food of the herring. The 
specific name was given to it in compliment to Professor 
Nordmann of Helsingfors, an able writer on parasitic Crus- 
tacea and other classes of animals. 
Fam. III. LYNGEIDM 
Two pairs of antennae; upper very short; lower of mode- 
rate size, branched, each branch divided into three joints. 
Five pairs of legs. Eye single, but with a black spot in front 
of it. Abdomen jointed. Dr. Baird informs us that Jurine, 
by isolating the young successively, obtained fifteen genera- 
tions of one of the species of this family, Chydorus spheericus. 
The various species swim rapidly, directing themselves by a 
