HYALODISCUS RUBICUNDUS. 107 
Vampyrella pedata Kuzin in Bot. Centralbl. VIII (1881), p. 
321; op. cit. X (1882), p. 347; op. cit. XI (1882), pp. 204, 
259, t. iv, ff. 1-19 ; in Bot. Zeit. XL (1882), col. 216, t.iva, 
ff, 27-82; and in Biol. Centralbl. II (1882), p. 189; Zorr 
Pilzthiere oder Schleimp. (1885), p. 106, f. 38, v—viii; 
Berrnorp Stud. Protopl.-mech. (1886), pp. 95, 104, t. ii, 
f. 1; Danezarp in Ann. Sci. Nat., Bot. (7) IV (1886), pp. 
2538, 255; Brocumann Mikr. Thierw. Siisswass. ed. 2 
(1895), p. 22, t. ii, £.40; G: S. West in Journ. Linn. Soc., 
Zool. XXVIII (1901), p. 334. 
Endoplasm finely granular, reddish, generally 
occupying the central part of the discoid body, with 
a highly-pellucid and broadish band of ectoplasm 
extending all round, and changing form, within certain 
limits, during the activity of the animal, sometimes 
projecting short conical or acute pseudopod-like 
prominences, but almost invariably, when progress is 
not intercepted, preserving the discoid character. 
Projections of the granular endoplasm, more or less 
numerous, extend (mostly in fine lines) from the ill- 
defined frontal margin of the endoplasm outwards to 
the periphery of the ectoplasm, but not beyond, with 
shorter and more variable ones intermixed. Posterior 
margin of the endoplasm more sharply defined, and 
destitute of the projections last mentioned. 
Dimensions: Length of hyaline disc 50-80 »; breadth 
about 30 p. 
In ponds amongst surface-vegetation; Cheshire. In 
the lakes at Capel Curig and in Lynn-y-cwm-ffynon, 
North Wales (G. S. West). 
This species is evidently closely related to Vam- 
pyrella vorax, but we have thought it right to preserve 
Hertwig and Lesser’s generic name, on account of the 
manifest peculiarities of the organism which those 
authors were the first to point out. It appears, under 
a moderate power of the microscope (to quote their 
description), as an oval body, reddish-brown in colour, 
gliding slowly along. Under higher magnification this 
