116 BRITISH ENTOMOSTRACA. 



same species. The first of these two authors, in his 

 'Enum. Insect. Austrife,' 1781, p. 536, No. 1119, de- 

 scribes it briefly as " Monoc. infusorius, testa bivalvi, 

 rostratus, ocuhs 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 Scha^ffer (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 

 Midler'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 J urine published his 

 ' 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 Midler'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 Midler, by Desmarest, in his ' Consid. 

 gen. sur les Crust.,' 1825; but we have no new infor- 



* Bcyt. zuf Naturg., p. 37, t. 3, f. x>; 17S1. 



