AMCEBA. 41 



less transparent, and susceptible of constant change, 

 the result of pseudopodal action. The pseudopodia 

 are never elongated and rigid, as in the resting-phase 

 of Dactylosphaerium radiosnm. From the genus Pelo- 

 myxa, with which they are apt to be confounded, the 

 Amoebae differ in possessing usually but a single 

 nucleus, all the known British Pelomi/xse being multi- 

 nucleated, much larger, and more slug-like in move- 

 ment than the largest Amcebse, and also more opaque 

 from the inception of large quantities of inorganic 

 matter. 



1. Amoeba proteus (Pallas) Leidy.* 



(Plate I, figs. 1-6 ; PI. Ill, fig. 2 ; and figs. 2, 5, 6, 

 and 15, in text.) 



Der kleine Proteus ROSKL Insecten-Beliist. (1755), p. 621, t. ci. 



Volvox chaos LINNJSUS Syst. Nat. ed. 10, I (1758), p. 821. 



Volvox proteus PALLAS Elencli. Zooph. (1766), p. 417. 



Chaos protheus LINN^US Syst. Nat. ed. 12, I, pt. 2 (1767), 

 p. 1326. 



Vibrio proteus 0. F. MULLER Verm. Terr, et Fluv. I (1773), 

 p. 45; GMELIN Limisei Syst. Nat. ed. 13 (1788), p. 3899. 



Proteus diffluens 0. F. MULLER Animalc. Infus. (1786), p. 9, 

 t. ii, ff. 1-12; ADAMS Ess. Micr. (1787), p. 477, t. xxv, 

 ff. 2, 3 ; BORY DE ST. VINCENT Vers, I (1791), p. 2, t. i, 

 f . 1, in Tabl. Encycl. Metli ; LAMARCK Syst. Anim. s. Vert. 

 (1801), p. 596, and Hist. Nat. Anim. s. Vert. I (1815), 

 p. 416; SCHRANK Fauna Boica, III (1803), 2, p. 24; BLAIN- 

 VILLE in Diet. Sci. Nat. (1826), p. 398; HOEVEN Handb. 

 Dierk. I (1828), p. 50; STARK Elem. Nat. Hist, II (1828), 

 p. 450; PEITCHAKD Animalc. (1834), p. 36, t. i, ff. 8-12. 



Proteus crystallinus SCHRANK Fauna Boica, III (1803), 2, 

 p. 24. 



Aiiiiba divergens BORY DE ST. VINCENT in Diet, class. Hist. 

 Nat. I (1822), p. 261. 



Amiba Roeselii BORY DE ST. VINCENT Zooph. (1824), p. 46, 

 in Encycl. Meth.; DUJARDIN Infus. (1841), p. 232. 



* The synonymy is not exhaustive, but it is hoped that it may be found 

 useful as indicating most of our sources of information on the various 

 species and their distribution. In a few cases the first and last or even 

 only one edition of a work is quoted, and some inferior illustrations in 

 recent works are not referred to. 



