AMG@BA PILOSA. 63 
one or more. The posterior extremity is produced 
into a delicately-fringed extension of faintly granular 
protoplasm, in which are usually to be seen one or two 
small vacuoles. Its external outline is irregular, with 
a tendency to become lobate. The entire body of the 
animal, including the posterior expansion, is covered 
with delicate spicules, radiating outwards, of equal 
length, and closely resembling those which invest the 
membranous test of Cochliopodium vestitum. This 
latter character at once distinguishes A. pilosa from all 
other known forms of Amaba. Locomotion is effected 
by lobular expansions of the ectoplasm, anterior or 
lateral. As in A. proteus and A. villosa the pseudo- 
podia may originate at any point of the body-surface. 
They have never been observed to become digitate. 
Dimensions: Length about 180 w; average breadth 
50 p. 
In ponds at Chelford, Cheshire, amongst floating 
vegetation ; associated with Mastigamneba aspera 
Schulze, Ciliophrys infusionwm Cienk., etc.; June, 
1908. In similar situations at Fearnhead, Lancashire. 
It is difficult to explain the origin and purpose of 
the delicate processes which so completely invest the 
body of this animal. Careful observation showed that 
upon the formation of a pseudopodal lobe, or broad 
eruptive expansion of the ectosarc, the spicules in- 
stantly flowed over it from the surrounding surface ; 
the continuity of the investment was thus ensured 
during all the animal’s movements. 
The Fearnhead examples of A. pilosa presented 
some differences from the typical Chelford form. 
They were probably older individuals. The investiture 
was the same, but it was observed that the individual 
spicules were stouter, and many of them were darker 
in colour, assuming often a yellowish-brown hue, 
whilst the endoplasm of the animal was denser. The 
posterior expansion was entirely wanting, and the 
animal was much less active. 
