80 BRITISH FRESHWATER RHIZOPODA. 
Pelomywa villosa Luipy Fresh. Rhiz. N. Amer. (1879), 
p. 73, t. v; Hrrewcock Synops. Freshw. Rhiz. (1881), 
p. 8; Gruber in Zeits. f. wiss. Zool. XLI (1885), p. 189, 
t. xi, ff. 1-4; Cerrzs Cap. Horn. Zool. VI (1889), Prot. 
p- 20; Bourne in Q. J. Micr. Sci. XXXII, n.s. (1891), 
p. 362, etc.; CasH in Trans. Manch. Micr. Soc. 1891 
(1892), p. 48; Frenzer Mikr. Fauna Argent. I, Prot. 1 
(1892), p. 21, t. iii, f. 18, and 4 (1897), p. 147, in Bibl. 
Zool. LV; Lorp in Trans. Manch. Micr. Soc. 1891 (1892), 
p. 96; Biocumann in Biol. Centralbl. XTV (1894), pp. 86, 
115; ? Scourrtenp in Proc. Zool. Soc. 1897, p. 787; 
PeEnarD in Rev. Suisse Zool. VIT, no. 1 (1899), p. 16, t. i, 
ff.7-19 ; Witson in Amer. Nat. XXXIV (1900) p. 548, etc. ; 
Igset in Atti Acc, Torino, XXXVI (1901), p. 68; G.S. 
West in Journ. Linn. Soc., Zool. XXVIII (1901), p.310; 
Casu in Journ. Linn. Soc., Zool. XXIX (1904), p. 218. 
Amewba lawreolata Prnarp Faune Rhiz. Léman (1902), 
p. 131, ff. 
In structure and general character closely resem- 
bling the preceding species, differing from it mainly in 
its somewhat smaller size, and in the possession of a 
caudal bulb, which is bordered with villi.  Leidy 
describes the organism as nearly opaque, except when 
young, appearing, by transmitted light, brown or 
black, with a hyaline border, but by reflected light 
yellowish white, varied with other colours dependent 
on the contained food. The body is spheroid or oval, 
in the resting condition slightly compressed; but in 
active movement it is generally more or less ovoid, 
with the broad extremity in advance, movement being 
effected by broad wave-like expansions of the anterior 
ectoplasm. The villi covering the terminal bulb are 
closely compacted, fihform, straight, simple or ramose, 
with a tendency in some individuals to become short 
and papillary. Frequently at the posterior extremity 
a bundle of pseudopodal processes, digitate or conical, 
composed of clear ectoplasm, will form either in the 
vicinity of the villous bulb or at some short distance 
from it, or they may be developed, singly or otherwise, 
on various parts of the body-surface. ‘They disappear 
during the animal’s activity. The contractile vesicles 
