ARGULUS. 255 



vention of males. He isolated six young females imme- 

 diately after birth. They underwent their usual changes 

 of shell, till the time when the sexual organs became fully 

 developed ; but though kept for some time, no appearance 

 of impregnation took place. To one of these he gave a 

 male ; copulation took place, and the animal became preg- 

 nant. The other five remained unimpregnated, and all 

 died of a peculiar disease, without having shown even the 

 slightest appearance of ova. 



1. ARGULUS FOLTACEUS. Tab. XXXI, figs. 1, 2. 



MONOCULUS FOLIACEUS, Lmtueus, Syst. Nat., edit. lOtb, i, 634, No. 2, 



175 8; Faun. Suec., edit. 2d. 

 ARGULUS FOLIACEUS, Jurine fils, Ann. Mus. d'Hist. Nat., vii, 431, 



t. 26, 1806. 



Leach, Diet, des Sc. Nat., xiv, 529. 

 Lamarck, Hist. Aiiim. s. Vert., v, 207- 

 Latreille, Regne Animal, iv, 195. 

 Desmarest, Consid. gen. sur les Crust., 331, 



t. 50, f. 1. 



Guerin, Iconog. Regne Anim. Crust., t. 35, f. 1. 

 Burmeister, Nov. Act., xvii, 332. 

 M. Edwards, Hist. Nat. Crust., iii, 444 ; Regne 



Auim., edit. Crochart, t. 78, f. 1. 

 Thompson, Ann. Nat. Hist., v, 221. 

 Garner, Nat. Hist, of Staffordshire. 

 Bosc, Man. d'Hist. Nat. Crust., ii, 220. 

 Kroyer, Tidsskrift, vol. i, pp. 190-203. 



Vogt, Nouv. Mem. Soc. Helvet., vii, t. 1, f. 2. 

 ARGULUS DELPHINUS, Midler, Entomost., 123, 1785. 



Hermann,M.em. Apterol., t. 5, f. 3, and t. 6, f.ll. 

 Latreille, Enc. meth., t. 334, f. 1-22, art. Ar- 



gulus, p. 100. 

 ARGULUS CHARON, Mutter, Entomost., t, 20, f. 1, 2. 



Latreille, Eiicycl. method , 1. c. 

 ARGULUS ARGULUS, Leach, Edin. Eucyclop., 1814, vii, p. 388, art. 



Crustaceology. 

 MONOCULUS DELPHINUS, Gmelin, Syst. Nat., edit. 13th, 1788. 



Manuel, Encyc. meth., vii, 730. 



MONOCULUS ARGULUS, Fabricius, Ent. Syst., ii, 489, 1793. 

 MONOCULUS GYRINI, Cuvier, Tab. element., 454, 1798. 



