102 BRITISH FRESHWATER RHIZOPODA. 
form. All Essex specimens examined were smaller 
and less active than those met with in Cheshire; they 
had less of the characteristic red colour; and, in some, 
one or more pulsating vesicles were distinctly visible. 
2. Vampyrella vorax Cienkowski. 
(Plate XI, figs. 4-6.) 
Vampyrella voraw Crenxowski in Arch f. mikr. Anat. I 
(1865), p. 223, tt. xili-xiv, ff. 64-73, and op. cit. XII, 
(1876), p. 24, tt. iv—v, ff. 14-17; Hacxen in Jen. Zeits. 
ft. Med. u. Nat. IV (1868), p. 133, and Biol. Stud. XII 
(1870), p.72; Macer in Rend. R. Ist. Lomb. (2) X (1877), 
pp. 364, 371; Kuzrty in Bot. Zeit. XL (1882), col. 213, 
and in Bot. Centralbl. XI (1882) pp. 195, 255, t. i1; 
Brocumann Mikr. Thierw. Siisswass. (1886), p. 19, and 
ed. 2 (1895), p. 22, t. ii, f. 37; Danegarp in Ann. Sci. 
Nat., Bot. (7) IV (1886), pp. 249, 253, t. ix, ff. 14-18, and 
in Le Botan. VII, 3 (1900), p. 131, t. iv; Pznarp in 
Mem. Soc. Phys. Genéve, XXXI, no. 2 (1890), p. 120, t. 1, 
ff. 17-20. 
? Vampyrella variabilis Kiuiy in Bot. Centralbl. VIII (1881), 
p. 821; op. cit. X (1882), p. 347; op. cit. XI (1882), 
pp. 189, 257, t. i; in Bot. Zeit. XL (1882), col. 214, t. iva, 
ff. 1-11; and in Biol. Centralbl]. II (1882) p. 187, f.; 
Zorr Pilzthiere oder Schleimp. (1885), p. 105, f. 8, u-vi; 
Danazarp in Ann. Sci. Nat., Bot. (7) IV (1886), pp. 252, 
254. 
Leptophrys vorax Zorv Pilzthiere oder Schleimp. (1885), 
p. 109, ff. 3,11; 9, v; 11, vii; Detace & Hérovarp Zool. 
coner. I (1896), p. 70, £. 55. 
Plasma-body minute, multiform, usually more or 
less elongated, and broader at one extremity than at 
the other ; changing constantly ; the extremities pro- 
duced into long tapering flexible pseudopodia, which 
sometimes branch at the base, and are formed of the 
same granular substance as the body. Other pseudo- 
podia of the same type are emitted laterally or tan- 
gentially from different parts of the surface, appearing 
and disappearing with the movements of the organism. 
The margins of the remarkably fluid, granular reddish 
plasma-body are usually ill-defined, that is to say, not 
