62 BRITISH FRESHWATER RHIZOPODA. 
outlined. The figures show the successive phases 
presented by an individual, le exhibiting a distinct 
approach to the mature form of A. verrucosa by the 
production of one or two of the characteristic verrucose 
protuberances. The movements of the organism were 
extremely slow. 
A good deal of confusion has arisen regarding 
wl. verrucosa Hhrenb.,and A. terricola Greeff. Leidy, and 
more recently Penard, regarded the two as synonymous. 
Blochmann, whilst maintaining the specific claims of 
A, terricola, gives, in ‘ Die Mikros. Thierw. des Siiss- 
wassers, a figure which represents the resting-phase, 
as we have seen it, of A. verrucosa. These animals 
are subject to great variation. Carter, who first de- 
scribed the minute dA. quadrilineata, subsequently 
arrived at the conclusion that it was a young state of 
A. rerrucosa.* In this Leidy and others concurred. 
The latter author also, in the series of forms which he 
figured, included what Penard has since distinguished 
as A. striata. In A. verrucosa Khrenb., Blochmann in- 
cludes A. quadvilineata Carter (80-100 »), and he main- 
tains A. terricola Greeff (350 ») as a separate species. 
For the present, and until ambiguities have been 
removed, we consider it safer to make A. terricola 
synonymous with the original A. verrucosa of 
Ehrenberg. 
10. Ameba pilosa Cash. 
(Plate IV, figs. 1-5.) 
Ameba pilosa Casu, in Journ. Linn. Soc., Zool. XXIX 
(1904), p. 219, t. xxvi, f. 8. 
Animal somewhat resembling an  average-sized 
-lmeeba villosa, with the same pale-bluish or neutral- 
tinted, finely oranular protoplasm, and containing, as 
in that species, a variety of corpuscles, mostly chloro- 
phyllous, together with refringent yellowish or brownish 
oil-like globules. Nucleus pale; contractile vesicles 
* «Ann, & Mag. Nat. Hist.,’ (2) xx (1857), p. 37. 
