VAMPYRELLA FLABELLATA. 105 
tint characteristic of other Vampyrelle; but this may 
have been a temporary or accidental condition. 
4. Vampyrella gomphonematis Heckel. 
(Pl. XI, figs. 13-15.) 
Vampyrellu gomphonematis Hacxet Biol. Stud. XII (1870), 
p. 163, t. vi, ff. 1-4, and in Jen. Zeits. f. Med. u. Nat. VI 
(1871), p. 28, t. ui, ff. 1-4; Aruman in Journ. Linn. Soc., 
Zool. XITI (1877), p. 421, £. 12; Btrscarr in Bronn’s 
Thier-Reichs, I. 6 (1880), t. xii, f. 18; Kuzrn in Bot. Zeit. 
XL (1882), col. 212, and in Bot. Centralbl. XI (1882), 
. 255; Lanessan ‘I'raité Zool., Prot. (1882), p. 28, 
ff. 14-16; Zorr Pilzthiere oder Schleimp. (1885), p. 108, 
f. 40; Danczarp in Ann. Sci. Nat., Bot. (7) IV (1886), 
pp. 253, 254; Macer in Boll. Scient. III, an. 10 (1888), 
p. 115 
Body, in its initial form, round or ovoid, with a 
reddish tinge, minute, very inactive; without apparent 
nucleus or contractile vacuole; its- surface covered 
with a mass of fine hair-like irregular pseudopodal 
filaments, giving the organism a villous appearance. 
The animal undergoes considerable mutation when 
feeding on diatoms (gomphonemas and naviculas) of 
which it appropriates the chlorophyllous contents. 
Dimensions : About 20-25 pw in diameter. 
In still pools, amongst Confervee ; Cheshire. 
V. gomphonematis is the smallest of the Vampyrelle, 
and lable to be passed by without recognition, unless 
engaged feeding on the stipitate Gomphonemz, as 
figured by Heckel, when it will expand and envelop 
an entire group of frustules with its soft plasma-body. 
In this process the pseudopodia undergo considerable 
modification (Pl. XI, fig. 15). We have never observed 
the animal in this condition. Ordinarily it is found 
feeding on Navicule, a single frustule of which it will 
envelop, and, after extracting the contents, reject the 
hard test, proceeding to others, and treating them 
similarly. 
