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. 



Six pairs of feet. Inferior antennae two-branched ; a 

 row of spinous filaments springing from the edge of larger 

 branch. Superior antennas of moderate size. 



1. SiDA. — One 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. 



Datune, MiiUer, Zool. Dan. Prodrom. 

 Daphnia, MiiUer, Eutomostraca. 



— Straus, Desmarest, Latreille, Lamarck, Bosc, Leach, M. Edtcards,8i,G. 

 MoNOCULUS, Liiinceiis, Poda, Blmnenbach, 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. lon- 

 gispina ; Tab. XI, figs. 3, 4, 5. Var. magna. 



MoNocuLUS PULEX, LinrKstis, Syst. Nat., 10th edit., i, 635, No. 4, 

 1758 ; 12th edit., i, 1058, No. 4. 



— Gmelin, Syst. Nat., 13th edit., i, 2999, No. 4. 



— Foda, lus. Mus. Grtecens., 124. 



— Midler, Fauu. Insect. Friedrichsdalens. 95. 



— Blumenbach, Haudbuch der Naturg., 399. 



— Manuel, Enc. meth., vii, 722, No. 15, t, 265, 



f. 1-4. 



— Fabriciiis, Entomol. Syst., ii, 491. 



