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 avec le Mi- 

 croscope" 1754, describes a species which he calls poisson nomme 

 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 Gemiiths 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. GeofFroy, 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 " Zoologiae 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 l'Histoiredes 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." 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 



