116 
BRITISH ENTOMOSTRACA. 
same species. The first of these two authors, in his 
‘Enum. Insect. Austrise,’ 1781, p. 536, No. 1119, de- 
scribes it briefly as “ Monoc. infusorius, testa bivalvi, 
rostratus, oculis duobus in rostro sitis,” and says it is 
very abundant in stagnant waters, and is perhaps the 
smallest of its congeners. Eichhorn gives a figure of his 
insect, says it is distinguished from that “ Wasserfloh” 
described by Schceffer (Daphnia), inasmuch as it has 
a pointed beak which lies close upon the mouth ; that 
it differs from it in its motion through the water, not by 
bounds, but swimming like other insects, and that it is 
exceedingly common.* These authors give little satis- 
factory information, however, respecting the genus ; and 
Muller’s characters are very indifferent, as will be shown 
more clearly hereafter. His species, without any original 
matter, are given by Gmelin, in his ‘ Syst. Natur. Linn./ 
1778; Manuel, in the ‘ Encyc. meth.,’ 1792; Eabricius, 
in his ‘ Entom. Syst./ 1793 ; Latreille, in his ‘ Hist. gen. 
et part, des Crust, et Ins/ 1802 ; and Lamarck, in his 
‘Hist. Nat. des Anim. s. Verteb.’ 1818: but no new 
species are added. 
Leach is the only British naturalist that has particularly 
noticed the genus Lynceus. In the Supplement to the 
‘ Encyc. Britann./ art. Annulosa, 1816, and in the 
‘Diet, des Scien. Nat.’ xiv, 541, 1819, he appears to 
have been sensible that it was ill formed, and splits it 
into two ; but with the exception of this, we have nothing 
new written upon the genus until Jurine published his 
f Hist, des Monoc.,’ in 1820. In this work he has given 
us a few particulars with. regard to the question of their 
having two eyes, the mode of reproduction, &c. He 
notices several of Muller’s species, describes three or four 
new ones, and hints at the necessity of reforming the 
genus altogether. These additional species are given, 
along with those of Muller, by Hesmarest, in his ‘ Consid. 
gen. sur les Crust.,’ 1825 ; but we have no new infor- 
Beyt. zur Naturg., p. 37, t. 3, f. d ; 17S1. 
