140 
BRITISH ENTOMOSTRACA. 
Ledermuller, in his work, ‘ Microscopischen Gemuths- 
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 GrBecensis,’ 1761, gives 
one species, the Monoc. conchaceus of Linnaeus, quoting 
merely his description. 
Geoffroy, 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. 
Muller, 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 Entomologiae,’ 1775, gives 
Linnaeus’s species, the Monoculus conchaceus; and l)e 
Geer, in his ‘Memoires pour servir a l’Histoire 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 Muller, with 
copious details and descriptions, and pretty accurate 
figures of all the species already shortly noticed in his 
* Zool. l)an. 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 Muller undertook the working out 
