VAMPYRELLA VORAX. 103 
indicated by any definite marginal line. Progression 
is mostly lateral, the broad side in advance emitting a 
mass of radiating pseudopodal filaments, some long and 
fine, others short and faintly capitate. No nucleus or 
contractile vacuole is visible. Reproduction is effected 
by encistment and the formation of swarm-spores. 
Dimensions variable; average length, exclusive of 
pseudopodia, 40-70 »; breadth 20-30 p. 
In ponds, amongst Conferve and floating Hypna; 
Cheshire. 
The habits of this species are not less singular than 
those of the preceding, from which, however, it differs 
very materially in form. The plasma-body is remark- 
ably fluid. Two individuals, coming together, fuse 
like drops of water, and, this having taken place, the 
compound organism pursues a career in all respects 
like that of the previously separate individuals, the 
only apparent difference being its increased size. 
This condition of V. voraw was found by Klein to 
follow encistment. The contents of the cist break up 
into “swarm spores,’ which attain their freedom, 
conjugate, and later form either double or multiple 
individuals (plasmodia). An example is figured 
(Plate XI, fig. 4) of two individuals, each containing a 
diatom incepted as food, having united in the manner 
described. As many as four are said to have been 
observed to fuse in this manner. 
The movements of the animal are habitually lateral. 
A considerable number of tentacle-like filaments are 
thrown out in the direction of progression. 
3. Vampyrella flabellata Cash. 
(Plate XI, figs. 7-12.) 
Vampyrella flabellata Cas in Journ. Linn. Soc., Zool. XXTX 
(1904), p. 224, t. xxvi, ff. 5, 6. 
In structure resembling the preceding species, and 
about the same in size, but differmg in habit; most 
