48 BRITISH FRESHWATER RHIZOPODA. 
to raise a doubt whether it really belongs to this 
species. Leidy, however, figures it as a form of A. 
proteus (‘Freshw. Rhiz. N. Amer.’, pl. i, fig. 4), and it 
may for the present be distinguished as var. granulosa. 
It has been held that inasmuch as A. proteus repro- 
duces by fission, the protoplasmic body may be divided, 
and propagation effected by artificial severance. This 
we think is more than doubtful. Gruber’s investiga- 
tion of the nucleus and its relation to the plasm, years 
ago, seemed to dispose of it. Deprived of the nucleus, 
says this observer, the plasma cannot sustain life. 
“The nucleus needs the plasm; the plasm the nucleus.” 
Occasionally, though very rarely, an injured Ameba is 
met with, and the injury may result in the death of the 
individual. A case of this kind, which came within our 
own observation, has already been described (see pp. 
28-29, f. 15). 
2. Ameoba actinophora Auerbach. 
(Plate I, figs. 7-10.) 
Ameba actinophora Avuursacu in Zeits. f. wiss. Zool. VII 
(1856), p. 392, t. xx; Mager in Rend. R. Ist. Lomb. (2) 
X (1877), p. 316; Grouper in Zeits. £. wiss. Zool. XXXVI 
(1881), p. 464, t. xxx, ff. 9-17, and (Enel. transl.) in Ann, 
Nat. Hist. (5) IX (1882), p. 110, t. ix, ff. 9-17; Birscmir 
Mikr. Schaume (1892), p. 78, t. ii, ff. 8, 9, and (Engl. 
transl.) Micros. Foams (1894), p. 107, t. iv, ff. 8, 4; 
FrevzeL Mikr. Fauna Argent. I, Prot. 3 (1893), p. 89, 
t. vill, ff. 19, 20, and 4 (1897), p. 147, in Bibl. Zool. IV; 
Catxins Prot. (1901), p. 38. 
? Cochliopodium actinophorum Panarp Faune Rhiz. Léman 
(1902), p. 188, ff. 
Plasma-body minute; when active resembling the 
smaller forms of Cochliopodinm bilimboswn, with a 
rounded outline, from one side of which two to six 
(sometimes more) short, simple, or branching pseudo- 
podia are protruded. According to Auerbach. the 
protoplasm is “distinctly surrounded by a double 
contour,” and the animal appears as if “covered by 
