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 uninipregnated, and all 

 died of a peculiar disease, Avithout having shown even the 

 slightest appearance of ova. 



1. Argulus foliaceus. Tab. XXXI, figs. 1, 2. 



MoNOCULUs FOLIACEUS, Limimis, Syst. Nat., edit. 10th, i, 634, No. 2, 

 1758 ; Eauu. Suec, edit. 2d. 



Akgulus foliaceus, Jurine Jils, Ann. Mus. d'Hist. Nat., vii, 431, 

 t.26, 1806. 



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



— Lamarck, Hist. Anim. s. Vert., v, 207. 



— Latreille, Regne Animal, iv, 195. 



— Desmarest, Consid. geu. snr les Crust., 331, 



t. 50, f. 1. 



— Guerin, Iconog. Regue Anim. Crust., t. 35, f. 1. 



— Burmeister, Nov. Act., xvii, 332. 



— if. Edwards, Hist. Nat. Crust., iii, 444 ; Regne 



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



— TJiompson, Ann. Nat. Hist., v, 221. 



— Garner, Nat. Hist, of Staffordshire. 



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



— Kroi/er, Tidsskrift, vol. i, pp. 190-203. 



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

 Akgulus delphinus, Muller, Entomost., 123, 1785. 



— TIermann,'yi.k.m. ApteroL, t. 5, f. 3, and t. 6, f. 11. 



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



gulus, p. 100. 

 Argulus chakon, Muller, Entomost., t 20, f. 1, 2. 



— Latreille, Encyel. method , 1. c. 



Argulus argulus, Leach, Edin. Encyclop., 1S14, vii, p. 388, art. 



Crustaceology. 

 MoNOCULUS delphinus, Gmelin, Syst. Nat., edit. 13th, 1788. 



— Mumiel, Eucyc. meth., vii, 730. 

 Monoculus Xrgulus, Fabricius, Ent. Syst., ii, 489, 1793. 

 MoNOCULUS GYRiNi, Cuvier, Tab. element., 454, 1798. 



