140 BRITISH ENTOMOSTRACA. 



Ledermuller, in his work, ' Microscopischen Gemiiths- 

 und Augen-ergotzung,' 1760, gives several figures of a 

 species of Cypris, and says, he has frequently seen them 

 in copulation. 



Poda, in his 'Insecta Mussei Grsecensis,' 1761, gives 

 one species, the Monoc. conchaceus of Linnaeus, quoting 

 merely his description. 



Geoffrey, in his ' Histoire des Insectes,' 1762, after a 

 few general remarks upon the Monoculi, describes shortly 

 two species of the genus, but gives no figures of them. 



Miiller, in his ' Fauna Insectorum Fridrichsdalina,' 

 1764, only mentions one species under the name and 

 description given by Linnaeus, in his ' Faun. Suec. ;' but 

 in 1771 he published an admirable paper in the 'Phi- 

 losophical Transactions' (attributed by M. Straus to 

 Mr. Bennet, but only communicated by him), in which he 

 gives an excellent account of two species in particular, 

 with many details of their anatomy and habits, and con- 

 cludes by giving a list of nine species, which he had at 

 that time discovered, including them all, however, under 

 the name of Monoculus. In his ' Zoologiae Danicse Pro- 

 dromus,' 1776, he first established the genus Cypris, 

 as well as the other genera of Entomostraca, all of which 

 had until then been constantly described under the general 

 name of Monoculus. 



Fabricius, in his ' Systema Entoniologia?/ 1775, gives 

 Linna3us's species, the Monocuhts conc/taceus ; and De 

 Geer, in his ' Meinoires pour servir a 1'llistoire des 

 Insectes,' 1778, describes one or two species, though he 

 calls them only varieties of the same, and adds a few 

 details concerning them. 



In 1785 appeared the 'Entomostraca' of Miiller, with 

 copious details and descriptions, and pretty accurate 

 figures of all the species already shortly noticed in his 

 ' Zool. Dan. Prod.,' and at the end of his paper in the 

 ' Philosophical Transactions,' which paper is also reprinted 

 in French, at the commencement of this excellent work. 

 Up to the time that Miiller undertook the working out 



