102 BEITISH 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 vorax CIENKOWSKI in Arch f. mikr. Anat. I 

 (1865), p. 223, tt. xiii-xiv, ff. 64-73, and op. tit. XII, 

 (1876), p. 24, tt. iv-v, ff. 14-17; H^ECKEL in Jen. Zeits. 

 f. Med. u. Nat. IV (1868), p. 133, and Biol. Stud. XII 

 (1870), p. 72 ; MAGGI in Rend. R, 1st. Lomb. (2) X (1877), 

 pp. 364, 371 ; KLEIN in Bot. Zeit. XL (1882), col. 213, 

 and in Bot. Centralbl. XI (1882) pp. 195, 255, t. ii; 

 BLOCHMANN Mikr. Thierw. Siisswass. (1886), p. 19, and 

 ed. 2 (1895), p. 22, t. ii, f. 37; DANGEARD 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 ; PENAKD in 

 Mem. Soc. Phys. Geneve, XXXI, no. 2 (1890), p. 120, t. i, 

 ff. 17-20. 



? Vampyrella varidbilisJLLKts in Bot. Centralbl. VIII (1881), 

 p. 321; 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. 137, f . ; 

 ZOPF Pilzthiere oder Schleimp. (1885), p. 105, f. 8, ii-vi; 

 DANGEAKD in Ann. Sci. Nat., Bot. (7) IV (1886), pp. 252, 

 254. 



Leptophrys vorax ZOPF Pilztliiere oder Schleimp. (1885), 

 p. 109, ff. 3, ii; 9, v; 11, vii; DELAGE & HEROUAKD Zool. 

 concr. I (1896), p. 70, f. 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 



