CRUSTACEA. 641 
Sp. Polyphemus oculus MuEuu., (Polyphemus pediculus L.?) Dr GuER Mém. 
s. l. ins. vu. Pl. 28, figs. 9, 10, MurELL. Entom. Tab. xx. figs. 1—5, 
Desmar. Crust. Pl. 54, figs. 1, 2, Koou, Herricu-ScuomFrnr Deutschl. 
Ins. Heft 187, Tab. 2. 
Evadne Loven. 
Compare 8. L. Lovin Lvadne Nordmanni, ein bisher unbekanntes Ento- 
mostracon, in WIEGMANN’S Archiv f. Naturgesch. 1838, pp. 143—166. 
Daphnia MUELL. (and Lynceus ejusd.). Feet ten, included in 
shell, the eight anterior foliaceous, ciliated. Larger antenne bifid, 
with branches having from two to four joints. 
Sp. Daphnia pulew Latr., Monoculus pulex L., SWAMMERDAM Bibl. nat. 
Tab. 31, figs. I—111, MuELL. Lntomostr. Tab. x11. figs. 4—7, DESMAREST 
Crust. Pl. 54, figs. 3—5 (borrowed from the figures of Srraus); the 
branched water-jlea. This species is reddish, especially in spring, and from 
its abundance may give a red colour to the water, or cause an apparent 
change of it into blood, of which SwamMMERDAM adduces a remarkable 
example, bl. 89, go. 
In the genus Lynceus MUELL. there is a black spot in front of the eye ; 
the antennz are usually very short. To these belongs Lynceus sphericus, 
&c. EDWARDS counts some of the species of Lynceus MuELL. in the 
genus Daphnia. BarrD adopts here different sub-genera, as Macrothriz, 
Eurycerus, Chydorus LEAcH, Camptocercus, Acroperus, Alona, Plewroxus, 
Peracantha (Ann. and Magaz. of Nat. Hist. Vol. x1. pp. 81—95, 1843), 
Bosmina (ibid. Vol. xvit. 1846, pp. 410—413). 
Compare on this genus H. E. Straus Mémoires sur les Daphnia, Mém. 
du Muséum, v. 1818, pp. 380—425, Pl. 29; vi. 1820, pp. 149—162; 
also W. Barry, Annals and Magaz. of Nat. Hist. 1. 1838, pp. 245—256. 
Pix: 
Acanthocercus SCHOEDL. . 
Compare J. Ep. ScHOEDLER, Veber Acanthocercus rigidus, ein bisher unbe- 
kanntes Entomostracon. Ericuson’s Arch. f. Naturgesch. 1846, s. 301— 
B04, Dats Xi, XII. 
Genus Latona Stravs, with bifid antenne, differs from Daphnia. 
Sp. Daphnia setifera MUELL. 
OrverR VI. Phyllopoda. 
Feet lamellose, branchial, in eight pairs or more: in some, other 
natatory feet besides inserted behind the former. Two compound 
eyes. 
Family XII. Branchiopoda. Body naked, without shell. Eleven 
pairs of branchial feet. Two eyes petiolated and a frontal ocellus 
sessile. 
VOL. I. 41 
