68 BRITISH ENTOMOSTRACA. 



memoir of Ramdohr added much to what they had 

 done. 



Lamarck, in his ' Hist. Nat. des Anim. sans Verteb.' 

 first edit. 1818, describes two of Miiller's species, and 

 Samouelle, in his 'History of British Insects,' 1819, 

 gives one. 



In Rees's ' Cycloptcdia,' 1819, we have all Miiller's 

 species ; while Leach, in his article " Crustaceology," in 

 the 'Edinburgh Encyclopaedia/ L823, only mentions the 

 pulex. 



From the time when Miiller's 'Entomostraca' appeared, 

 up to this period, no additions to the species had been 

 made ; and, with the exception of Ramdohr's memoir 

 already mentioned, no original matter had been pub- 

 lished concerning the family, though, as I have already 

 observed, this work of Ramdohr seems to have attracted 

 no notice from any of the authors who succeeded him. 



In 1830, Jurine's splendid work on the ' Monoc. qui 

 se trouvent aux Envir. de Geneve,' made its appearance, 

 after the death of the talented and lamented author ; it 

 abounds in a variety of extremely interesting information, 

 not only with regard to their anatomy, but to their habits 

 and manners. About the same period, an elaborate and 

 excellent paper on the family was read before the Academy 

 in Paris, by M. Straus, and pubhshed in the ' Memoires 

 du Museum, d'Hist. Nat.' 1821. To these two authors 

 we owe the greater part of our knowledge of these cu- 

 rious animals ; their labours and experiments having 

 brought to light much information with regard to their 

 economy, which had escaped all the previous writers. 

 Jurine describes six species, which had not been observed 

 by Miiller, and Straus three, though some of them seem 

 to be only varieties. 



Desmarest, in his work ' Consid. gen. sur les Crust.,' 

 1825, enumerates fourteen sp'ecies which had been de- 

 scribed by the authors who had written before his time, 

 and which had been found in Erance, but adds no new 

 ones. 



