FRESHWATER RHIZOPODS AND HELIOZOA. 313 
and retract these pseudopodia with considerable rapidity of 
movement. 
The body-protcplasm within the shell is of a much darker hue 
than the pseudopodia, and, with the exception of a few instances 
in which it was homogeneous, exhibits a number of prominent 
granules. No nucleus was present in any of the individuals, 
but some possessed one or more vacuoles, which, however, were 
never observed to pulsate. 
C. minutum is readily distinguished from C. bilimbosum by its 
minute size, its more delicate shell, and the absence of a nucleus- 
Moreover, it does not possess the punctate, expanded band of 
the shell in the region of the mouth. 
11. CocuLiopopium vEsTITUM, Archer, in Qu. Jour. Mier. 
Sci. 1876, p. 299; 1877, p. 334; Letdy, Freshw. Rhiz. N. Amer. 
1879, p. 188, t. xxxii. ff. 26-28.—Amphizonella vestita, Archer, 
l. c. 1871, xi. pp. 112, 135, t. vi. ff. 1-6. Cochliopodium pilosum, 
Hertwig g Lesser, in Archiv fiir mikr. Anat. 1874, x. Suppl. 
p- 78. 
Esher West-end Common, Surrey. It occurred in great 
abundance in ditches and ponds among various Alge: June- 
Aug. 1894-5. Diameter without spines 25-45 p; length of 
spines 3°7-5 py. The majority of the individuals were colourless, 
but a few possessed chlorophyll granules. 
Sheep’s Green, Cambridge, July 1896, somewhat scarce. 
None of the individuals possessed any colouring-matter. 
I am inclined to agree with Schulze (in Archiv fir mikr. 
Anat. xi. p. 837) that the chlorophyll granules trequently found 
in individuals of this Rhizopod have been originally taken into 
the body-protoplasm as food. 
12. CocHLIOPODIUM LONGISPINUM, sp. un. (PI, 28. fig. 1.) 
Shell very thin and delicate, subspherical, with a broadly open, 
somewhat prominent mouth; exterior of shell covered with very 
long, extremely delicate, hair-like, radiating spies. Body- 
protoplasm granular, and with many highly-refractive globules. 
Nucleus large and round, situated towards the fundus. With 
one (or sometimes more) contractile vacuoles. Pseudopodia few 
broad and expansive, granular in the central part but hyaline 
and indistinct towards the edges. 
