ARGULUS. 245 



Fabricius, in his ' Entomologia Systematical 1793, in- 

 troduces a species amongst his Monoculi, under the name 

 of 3Iotioc. Argulus ; but though he quotes the Argulus 

 delj)hini of Milller as being the animal he alludes to, his 

 description of the species, which he gives at considerable 

 length, is totally different from that of Miiller, or any 

 other author. 



Cuvier, in his ' Tableau element. del'Hist. Nat./ 1798, 

 mentions the Argnlus under the name of Monoculus 

 gi/rini, 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 Geoffrey's name of " le binocle de gaste- 

 roste." For 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 Miiller 

 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 Geoffrey, and 

 in the ' Regne Animal,' 1829, adopting Miiller'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 



