AMCEBA VERRUCOSA. 11 



Amoeba terricola 



GBEEFF (pars) in Arch. mikr. Anat. II (1866), pp. 302-317, pi. xvii, 



ff. 2-8 ; pi. xviii, f . 10. 

 Amoeba papyracea 

 PENARD in Arch. Protist. VI (1905), pp. 191-201, ff. 8, 14; op. cit. 



XXVII (1909), p. 266; XXVIII (1912), pp. 82-83. 

 GROSSE-ALLERMANN in Arch. Protist. XVII, 2 (1909), pp. 206, 216, 



pi. 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 /A when extended; diameter 

 160-190 /A in a globular state. 



Habitat. Mosses. 



ENGLAND. Eccleshall, Yorkshire (Brown). 



The A. verrucosa group (comprising A. verrucosa, 

 A. fibrillosa, A. alba, and A. sj>hxronurleolus) 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. papyrncea is usually provided 

 with a layer of larger granules within the periphery 

 than in the type. A. verrucosa measures about 

 90-100 p in diameter when at rest and rarely reaches 

 250 fji in length when in movement. Grosse-Allermann 

 (1909) and Penard should be consulted for a detailed 

 study of this group of Amcebse. 



5. Amoeba alba Greeff. 

 (Plate LIX, fig. 4.) 



Amoeba albu > 



GREEFF in Biol. Centralbl. XI (1891). p. 640. 



PENARD Faune Bhiz. Leman (1902), pp. 123-125, 2 figs. ; in Arch. 

 Protist. VI (1905), pp. 203-204; Sarcodines in Cat. Invert. Suisse 

 (1905), p. 24. 

 WAILES & PENARD in Proc. R. Irish Acad. XXXI, LXV (1911), p. 65. 



Plasma colourless, finely granular except near the 

 periphery, contained in a fine pellicle ; nuclei numerous, 

 spherical or sub-spherical, containing numerous 



