52 BRITISH FRESHWATER RHIZOPODA. 
present, for they are found in similar situations, and 
not infrequently in the same water. 
The villous appendage of A. villosa is capable of such 
modification as is shown by occasional contraction and 
expansion, but the villi always remain closely com- 
pacted, and apparently passive. Their appearance in 
the aggregate is that of a bundle of short threads; in 
this respect differing from the analogous organ in 
Pelomyza villosa where the villi are thicker and shorter. 
Apart from these features the two organisms are not 
likely to be confounded, as they differ widely in the 
important matter of internal structure. 
4. Ameba gorgonia Penard. 
(Plate ITI, figs. 3-5.) 
Ameeba gorgonta Prnarp Faune Rhiz. Léman (1902), 
p. 78, ff. 
Body when in repose globular, with a variable num- 
ber of radiating mobile arms, outwardly extended on 
all sides, as represented in PI. III, fig. 3. Penard 
observes that this attitude of the animal is induced by 
exposure to light. An individual, first met with in 
this condition, kept some of the pseudopodal arms 
moving constantly, until they disappeared under a 
sudden wave-like emission of ectoplasm. Upon this 
the animal began a forward movement, dragging 
behind it the remaining pseudopodia (fig. 4) which in 
their turn also became absorbed. Afterwards the 
animal rapidly underwent a series of modifications. 
One of the forms it assumed is represented by fig. 5. 
Our Cheshire examples exhibited all the peculiarities 
of structure described by Penard. The pseudopodia 
were cylindrical, of uniform thickness, and rounded at 
their extremities, never pointed as in some forms of 
Dactylospherinn vadiosum. They were filled with the 
same granular endoplasm as the rest of the body (a 
feature regarded by Penard as of especial significance), 
