10 BRITISH FRESHWATER EHLZOPODA. 



3. Amoeba vespertilio Penard. 

 (Plate LVIII, fig. 2; PL LIX, figs. 1-3.) 



Amoeba proteus 



LEIDY (pars) Freshw. Rhiz. N. Amer. (1879), p. 48, pi. iv, ff. 22-24. 

 Amoeba vespertilio 



PENARD in Rev. Suisse Zool. IX (1901). p. 237 ; Faune Rhiz. Leman 



(1902), pp. 92-95, 7 figs. ; Sarcodines in Cat. Invert. Suisse (1905), 



p. 22. 

 BROWN in Naturalist, 1910, p. 91; in Jrn. Linn. Soc., Zool. XXX 



(1910). p. 361. 



WAILES & PENARD in Proc. R. Irish Acad. XXXI, LXV (1911), p. 14. 

 WAILES in Naturalist, 1913, p. 145 ; in Jrn. Linn. Soc., Zool. XXXII 



(1912), p. 123. 



Body usually ovoid or elongated without any caudal 

 appendage ; pseudopodia conical, comparatively short, 

 connected at the base by web-like expansions of the 

 ectoplasm ; plasma colourless, containing numerous 

 granules and food-particles; nucleus single, spherical, 

 containing a single large nucleole ; contractile vesicles 

 from one to three in number ; numerous small vacuoles 

 also often present. 



Length 60-100//,. 



Habitat. Ponds and submerged vegetation. Com- 

 mon. 



ENGLAND. Cumberland, Westmorland, Lancashire, 

 and Yorkshire (Broiwii) ; Shropshire. 



SCOTLAND. Ayrshire and Wigtonshire (Broivn). 



IRELAND. Achill Isl., Clare Isl., Inishturk, Mayo. 



The character of the pseudopodia usually serves to- 

 distinguish this species with facility, their palmate 

 appearance resembling a bat's wing or the webbed 

 foot of a bird ; rarely, longer and attenuated pseudo- 

 podia are formed, but when the animal begins to move 

 they resume their characteristic aspect. 



4. Amoeba verrucosa var. papyracea (Penard) 

 var. nov. 



(Plate LVIII, fig. 3.) 



Amoeba verrucosa 



EHRENBERG (pars) Infus. (1838), p. 126, pi. viii, f. xi (3). 



