PSEUDOSPORA VOLVOOIS, CIENKOWSKI. 215 
PsEUDOSPORA VOLVOCIS, CIENKOWSEI. 
There are three adult forms: A. an ameeboid form; 
B. a flagellate form; and C. a radial form, with very fine 
pseudopodia. Cienkowski’s paper describes only the first two 
of these forms. 
A. Ameboid form. Size, ‘012 mm. to ‘03 mm. 
Structure. 
Kcetoplasm.—In the amceboid Pseudospora (fig. 1) there 
is a narrow band of not very markedly differentiated ecto- 
plasm forming a comparatively firm outer layer which is 
capable of being prolonged from time to time into pseudo- 
podial processes. The shape of the creature is very changeable 
and inconstant. The pseudopodia, which are sometimes very 
long, vary considerably in shape ; they can be extended from 
apparently any part of the animal, and, though seen to branch, 
do not anastomose. The pseudopodia are frequently pro- 
longed into either very fine processes, in which case they are 
often arranged in bunches, as in fig. 2, or else are simply 
broad at the base and pointed at the end. Occasionally, how- 
ever, blunt pseudopodia are met with. The various forms of 
pseudopodia merge into one another, and are capable of 
changing shape with considerable rapidity. The longer and 
more slender processes are in some specimens occasionally 
bent backwards and forwards after the fashion of flagella, 
but the movement is fitful and slow. 
Endoplasm.—The endoplasm alters greatly in character 
according to the exact condition of the animal. In very young 
specimens, and in individuals which have been in the free- 
swimming state for a considerable time, the protoplasm pre- 
sents a very homogeneous and hyaline appearance. If no 
food has been ingested for some time, the endoplasm is usually 
somewhat grey in colour, with highly refractive granules, 
apparently of stored-up food material; the number and size 
of these are quite inconstant. After feeding, however, 
vot. 49, part 1,—NEW SERIES. 16 
