62 BRITISH FRESHWATER RHIZOPODA. 



outlined. The figures show the successive phases 

 presented by an individual, 1 c 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 

 A. verrucosa Ehrenb., and A. terricola Green . 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 A. qitadrilineata, subsequently 

 arrived at the conclusion that it was a young state of 

 A. verrucosa.* 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 Ehrenb., Blochmann in- 

 cludes^, quadrilineata Carter (80-100 /A), 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. Amoeba pilosa Cash. 

 (Plate IV, figs. 1-5.) 



Amoeba pilosa CASH, in Journ. Linn. Soc v Zool. XXIX 

 (1904), p. 219, t. xxvi, f. 8. 



Animal somewhat resembling an average-sized 

 Amceba villosa, with the same pale-bluish or neutral- 

 tinted, finely granular 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. 



