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 foliacetjs. Tab. XXXI, figs. 1, 2. 
Monoculus foliacetjs, Linnceus , Syst. Nat., edit. 10th, i, 634, No. 2, 
1758 ; 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. Anim. s. Yert., 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 
Anim., edit. Crochart, t. 78, f. 1. 
— Thompson, Ann. Nat. Hist., v, 221. 
— Garner , Nat. Hist, of Staffordshire. 
— Bose, 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, Muller, Entomost., 123, 1785. 
— Hermann, Mem. Apterol., t. 5, f. 3, and t. 6, f. 11 . 
— Latreille, Enc. meth., t. 334, f. 1-22, art. Ar- 
gulus, p. 100. 
Argulus charon, Muller, Entomost., t, 20, f. 1, 2, 
— Latreille, Encycl. method , 1. c. 
Argulus argulus, Leach, Edin. Encyclop., 1814, vii, p. 388, art. 
Crustaceology. 
Monoculus delphinus, Gmelin, Syst. Nat., edit. 13th, 1788. 
— Manuel, Encyc. meth., vii, 730. 
Monoculus argulus, Eahricius, Ent. Syst., ii, 489, 1793. 
Monoculus gyrini, Cuvier, Tab. element., 454, 1798. 
