AMC@BA. 4] 
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 Dactylospheriwm radiosum. From the genus Pelo- 
myzxa, with which they are apt to be confounded, the 
Amobe differ in possessing usually but a single 
nucleus, all the known British Pelomyze being multi- 
nucleated, much larger, and more slug-like in move- 
ment than the largest Amabex, and also more opaque 
from the inception of large quantities of inorganic 
matter. 
1. Ameba proteus (Pallas) Leidy.* 
(Plate I, figs. 1-6; Pl. IIT, fig. 2; and fier. 2, 5, 6, 
and 15, in text.) 
Der kleine Proteus Rosut Insecten-Beliist. (1755), p. 621, t. ci. 
Volvow chaos Linnaus Syst. Nat. ed. 10, I (1758), p. 821. 
Volvox proteus Patias Elench. Zooph. (1766), p. 417. 
Chaos protheus Linnmus Svst. Nat. ed. 12, I, pt. 2 (1767), 
p. 1826. 
Vibrio proteus O. F. Mttier Verm. Terr. et Fluv. I (1773), 
p. 45; Guz.in Linnei Syst. Nat. ed. 13 (1788), p. 3899. 
Proteus difluens O. F. Mttter Animalc. Infus. (1786), p. 9, 
t. 11, ff. 1-12; Apams Ess. Mier. (1787), p. 477, t. xxv, 
ff. 2,3; Bory pm Sr. Vincenr Vers, I (1791), p. 2, t. i, 
f.1, in abl. Encycl. Méth; Lamarck Syst. Anim. s. Vert. 
(1801), p. 596, and Hist. Nat. Anim. s. Vert. I (1815), 
p. 416; Scuranx Fauna Boica, III (1803), 2, p. 24; Buarn- 
VILLE in Dict. Sci. Nat. (1826), p. 398; Hozven Handb. 
Dierk. I (1828), p. 50; Svarx Elem. Nat. Hist. 1I (1828), 
p. 450; PrircHarp Animalc. (1834), p. 36, t. i, ff. 8-12. 
Proteus crystallinus Scurank Fauna Boica, III (1808), 2, 
p. 24. 
Amiba divergens Bory pr St. Vincent in Dict. class. Hist. 
Nat. I (1822), p. 261. 
Amiba Reeselit Bory pz St. Vincenr Zooph. (1824), p. 46, 
in Encycl. Méth.; Dusarprn 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. 
