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 Midlers species, and 
Samouelle, in his ‘History of British Insects/ 1819, 
gives one. 
In Rees’s ‘Cyclopaedia/ 1819, we have all Midler’s 
species ; while Leach, in his article “ Crustaceology,” in 
the ‘Edinburgh Encyclopaedia/ 1828, only mentions the 
jpulex. 
From the time when Midler’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 1820, 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 published 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 Muller, and Straus three, though some of them seem 
to be only varieties. 
Desmarest, in his work ‘ Consid. gen. sur les Crust./ 
1825, enumerates fourteen species which had been de- 
scribed by the authors who had written before his time, 
and which had been found in France, but adds no new 
ones. 
