History of British Entomostraca. 515 
to by Muller. Linnaeus in his Fauna Suecica, 1746, describes a 
species in a few general terms; and in the 7th edition of his Syste- 
ma Naturae, 1748, he mentions a species under the name of Monocu- 
lus concha pedata, but gives no description. In the 10th edition of 
the same work, edited by Langius, 1760, he gives the description as 
taken from the Fauna Suecica, but names it Monoculus conchaceus. 
Joblot, in his " Observations d'Histoire Naturelle faites avecle Mi- 
croscope" 1754, describes a species which he calls poisson nomine 
Delouche, or grain de millet, from its resemblance in size and colour 
to that species of seed, and gives a figure of it. Ledermuller, in his 
work on the microscope, " Mikroskopischer Gemuths und augen- 
ergotzung, &c." 1760, gives several figures of a species of Cypris, 
and says he has frequently seen them in copulation. Poda, in his 
" Insecta MusaeiGraecensis," 1761, gives one species, the Monoc. con- 
chaceus 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 this genus, but gives 
no figures of them. Muller, in his " Fauna Insectorum Fridrichs- 
dalina," 1764, only mentions one species, under the name and de- 
scription given by Linnaeus in his " Fauna Suecica," but in 1771 he 
published an admirable paper in the " Philosophical Transactions," 
attributed by M. Straus to Mr Bennet ; but only communicated to 
the Royal Society through him, in which he gives an excellent ac- 
count of two species in particular, with many details of their ana- 
tomy and habits, and concludes by giving a list of nine species which 
he had at that time discovered ; he includes them all, however, under 
the name of Monoculus. In his " Zoologise Danicaeprodromus," 1776, 
he first established the genus Cypris, as well as the other genera of 
his Entomostraca, all of which till then had been constantly de- 
scribed under the general name of Monoculus. Fabricius in his 
" Systema Entomologiae" 1775, gives the species which Linnaeus 
had already described, the Monoc. conchaceus ; and De Geer, in his 
" Memoirespourservir a THistoiredes Insectes," 1778, describes one 
or two species, though he calls them only varieties of the same, and 
gives a few details concerning them. In 1785 appeared the " En- 
tomostraca" of Muller, with copious details and descriptions, and 
pretty accurate figures of all the species already shortly described 
by him in his " Zoolog. Dan. prodrom." k and_'at the end of his paper in 
the Philosoph. Trans., which paper is also reprinted in French, at 
the commencement of this excellent work. Till the time that Mul- 
ler undertook the working out of the species of this genus, our know- 
ledge of them was scanty indeed. The descriptions found in the 
