AM@BA VERRUCOSA. 11 
Ameba terricola 
GREEFF (pars) in Arch. mikr. Anat. IT (1866), pp. 302-317, pl. xvii, 
ff. 2-8; pl. xviii, f. 10. : 
Ameba papyracea 
PENARD in Arch. Protist. VI (1905), pp. 191-201, ff. 8,14; op. cit. 
XXVII (1909), p. 266; XXVIII (1912), pp. 82-83. 
ee ey sa in Arch. Protist. XVII, 2 (1909), pp. 206, 216, 
pl. xi, ff. 7, 8. 
Brown in Brit. Assoc. Handb. Sheffield (1910), p. 500; in Naturalist, 
1910, p. 91. 
Similar to the type but larger. 
Length up to 350 » when extended; diameter 
160-190 yw in a globular state. 
Habitat.—Mosses. 
Enetanp.—Kccleshall, Yorkshire (Brown). 
The A. verrucosa group (comprising A. verrucosa, 
A. fibrillosa, A. alba, and A. spheronucleolus) is charac- 
terized by the possession of a firm outer pellicle which 
enables the animals to resist desiccation and to survive 
the dry periods so apt to occur in the mosses which 
they inhabit. A. verrucosa and this variety are further 
distinguished by the possession of a nucleus ovoid in 
shape, and that of var. papyracea is usually provided 
with a layer of larger granules within the periphery 
than in the type. <d. verrucosa measures about 
90-100 » in diameter when at rest and rarely reaches 
250 win length when in movement. Grosse-Allermann 
(1909) and Penard should be consulted for a detailed 
study of this group of Amcebe. 
5. Amoeba alba Greeff. 
(Plate LIX, fig. 4.) 
Ameba albu 
GREEFF in Biol. Centralbl. XI (1891), p. 640. ; 
PEnarD Faune Rhiz. Léman (1902), pp. 123-125, 2 figs.; in Arch. 
Protist. VI (1905), pp. 203-204; Sarcodinés in Cat. Invert. Suisse 
(1905), p. 24. 
Wares & PenarD in Proc. R. Irish Acad. XXXI, xv (1911), p. 65. 
Plasma colourless, finely granular except near the 
periphery, contained in a fine pellicle; nuclei numerous, 
spherical or sub-spherical, containing numerous 
