ARGULUS. 
245 
Eabricius, in his ‘ Entomologia Systematica/ 1793, in- 
troduces a species amongst his Monoculi, under the name 
of Monoc . Argulus ; but though he quotes the Argulus 
deljphini of Muller as being the animal he alludes to, his 
description of the species, which he gives at considerable 
length, is totally different from that of Muller, or any 
other author. 
Cuvier, in his ‘ Tableau element, de l’Hist. Nat./ 1798, 
mentions the Argulus under the name of Monoculus 
ggrini , or “Pou de tetard,” having found it upon the tad- 
pole of the common frog. The same celebrated author 
read, at one of the early meetings of the Philomathic 
Society, a paper containing a number of excellent observa- 
tions upon the anatomy and physiology of the same 
creature, under Geoffroy’s name of “ le binocle de gaste- 
roste.” Por the contents of this paper we are indebted 
to M. Latreille, who, in his ‘ Hist. Nat. Crust./ 1802, 
describes the species of insect mentioned by Cuvier under 
the name of Ozolus gasterostei , retaining the generic name 
of Argulus for the species erroneously described by Muller 
from the young individual. In his later publications, how- 
ever, he cancels the genus ; in the ‘ Genera Crust, et Ins./ 
1806, referring it to the genus Binoculus of Geoffroy, and 
in the ‘ Regne Animal/ 1829, adopting Muller’s name of 
Argulus. 
Hermann fils, in his ‘Memoire apterologique/ 1804, 
has made a good many observations upon this little 
creature, and given two tolerably good figures of it. The 
most elaborate description, however, that has been given 
is by Jurine fils, in the ‘ Ann. Mus. d’Hist. Nat/ 1806. 
In a very lengthened memoir he has given a complete 
history of what had been known previous to his time, and 
followed that up by most careful dissections and patient 
observations as to its habits and nature. The memoir is 
accompanied with excellent figures, and indeed leaves 
little to be done by future labourers in the field but to 
corroborate his statements. Hitherto all the descriptions 
of and observations made by different naturalists upon 
