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 antennae of moderate size. 



1. SID A. 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. 



DAPHNE, Mutter, Zool. Dan. Prodrom. 

 DAPHNIA, Mutter, Entomostraca. 



Straus, Desmarest, Latreille, Lamarck, Bosc, Leach, M. Edwards,&c. 

 MONOCULUS, Lmnteus, Poda, Blumenbach, De 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. 



MONOCUIATS PULEX, Linnaus, 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. 



Mutter, Faun. Insect. Friedrichsdalens. 95. 



Blumenbach, Haudbuch der Naturg., 399. 

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



f. 1-4. 



Fabriciris, Entomol. Syst., ii, 491. 



