DAPHNIA. 
89 
4. Bosmina. — Head terminating anteriorly in a sharp 
beak, directed straight forwards. Superior antennae long, 
many-jointed, and projecting from the extremity of the 
beak. 
sidina. /ai> 
■ . . -tap*** 
Six pairs of feet. Inferior antennae two-branched ; a 
row of spinous filaments springing from the edge of larger 
branch. Superior antennae of moderate size. 
1. Sida. — O ne branch of inferior antennae with three, 
the other with two articulations. 
2. Daphnella. — Both branches of inferior antennae, 
consisting each of only two joints. 
DAPHNINA. 
Genus 1 — Daphnia. 
Daphne, Muller , Zool. Dan. Prodrom. 
Daphnia, Muller , Entomostraca. 
— Straus , Desmarest , latreille , Lamarck , Bose, Leach , M. Edwards, &c. 
Monoculus, Linnaeus , JPoda, Blumenbach, Be Geer , Jurine, Manuel , &c. &c. 
Character . — Head produced downwards into a more or 
less prominent beak. Superior antennae exceedingly 
small, one-jointed, and situated under the beak ; inferior 
antennae large and powerful. 
1. Daphnia pulex. Tab. VI, figs. 1-3, male and female ; 
Tab. IX, fig. 5, jun. ; Tab. VII, figs. 3, 4, Var. Ion - 
gispina ; Tab. XI, figs. 3, 4, 5. Var. magna. 
Monoculus pulex, Linnaeus , Syst. Nat., 10th edit., i, 635, No. 4, 
1758 ; 12th edit., i, 1058, No. 4. 
— Gmelin , Syst. Nat., 13th edit., i, 2999, No. 4. 
— Poda , Ins. Mus. Grsecens., 124. 
— Muller , Eann. Insect. Eriedrichsdalens. 95. 
— Blumenbach , Handbuch der Naturg., 399. 
— Manuel , Enc. meth., vii, 722, No. 15, t. 265, 
f. 1-4. 
— Fabricius , Entomol. Syst., ii, 491. 
