52 BRITISH FRESHWATER RH1ZOPODA. 



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 

 Pelomym 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. Amoeba gorgonia Penard. 

 (Plate III, figs. 3-5.) 



Amoeba gorgonia PENARD Faune Rhiz. Leman (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 PL 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 

 Dactylosplixrium radiosum. They were filled Avith the 

 same granular endoplasm as the rest of the body (a 

 feature regarded by Penard as of especial significance), 



