110 BRITISH FRESHWATER RHIZOPODA. 
p. 149, in Bibl. Zool. IV; Catxins Prot. (1901), p. 56, 
and in Amer. Nat. XXXV (1901), p. 647, f. 1. 
? Heterophrys myriapoda ARCHER in Q. J. Micr. Sci. X, ns. 
(1870), p. 100, t. xvi, f. 4; 
Heterophrys varians F. E. Scuutze in Arch. f. mikr. Anat. 
X (1874), p. 386, t. xxvi, ff, 2-5. 
Heliophrys variabilis Grrurr in Arch. f. mikr. Anat. XI 
(1875), p. 28, t. ii, ff. 20-23; AtnmMaw in Journ. Linn. 
Soc., Zool. XIII (1877), p. 385, ff. 1, 2. 
Heliophrys varians G. 8S. West in Journ. Linn. Soc., Zool. 
XXVIII (1901), p. 386. - 
Body in the initial (resting) state heliozoon-like, 
generally with a more or less hyaline margin, and 
invested with a gelatinous envelope of variable thick- 
ness, which is fimbriated on the outer edge, and 
surrounded by numerous short radiating acineta-like 
processes. The pseudopodia usually rigid, tapering 
from an expanded base, and formed of hyaline ecto- 
plasm; sometimes branched; m certain (presumably 
young) states the pseudopodia are straight or whip- 
like, slender, and mobile, and the animal is destitute 
of any external covering. During activity the move- 
ments of the adult are rapid; the body becomes 
elongated, or roughly triangular, the outer envelope 
adapts itself to the forms assumed, and the pseudopodia 
—often grouped at the angles—become more elongated, 
extend far beyond the margin of the envelope, and 
exhibit a tendency to branch, always preserving their 
rigidity. The body in such individuals is often 
crowded with bright-green food-particles, with some 
oil-like globules; younger ones are freer of coloured 
matter and more transparent; and a contractile vacuole 
and one or more nuclei are generally visible. 
Dimensions: Diameter of body (without pseudopodia) 
40 2, or over. 
Ponds in Cheshire, 1890. In ditches near Brigg, 
Lincolnshire (G. 8. West). In the ooze of ponds and 
in marshes, Ireland (IV. Archer). 
Considerable ambiguity has always hung around 
