Order I. AMCEBINA. 

 Family 1. LOBOSA. 



1. Amoeba fluida Gruber. 

 (Plate LVIII, fig. 1.) 



Amoeba fluida 



GRTTBEB in Zeits. wiss. Zool. XLI, 2 (1884), pp. 219-220, pi. xv, f. 49. 

 PENARD Faune E-hiz. Leman (1902), pp. 42-44, 6 tigs. ; Sarcodines in 



Cat. Invert. Suisse (1905), p. 13. 

 HOPKINSON in Irish Natur. 1910 (Jan.), p. 2. 

 BROWN in Naturalist, 1910 (Feb.), p. 91 ; in Brit. Assoc. Handb. 



Sheffield (1910, Aug.), p. 501. 

 WAILES in Jrn. Linn. Soc., Zool. XXXII (1912), p. 123. 



Body ovoid with rounded outlines, more or less 

 yellowish in colour, the expansions of the plasma 

 lobular or wave-like; the plasma finely and densely 

 granular, the granules being in continual motion both 

 vibratory and circulating; nucleus single, colourless, 

 containing a granular nucleole and usually several 

 vacuoles ; one to three contractile vesicles usually 

 present. 



Length 50-80 /A or more. 



Habitat. Ponds and aquatic vegetation. 



ENGLAND. W. Yorkshire* ; Derbyshire (Brown). 

 IRELAND. Killough, Co. Wicklow (Hopldnson). 



The constant vibratory movements of the numerous 

 granules in the plasma and the circulation of the 

 plasma as a whole are striking features in this 

 species. Progression takes place by wave-like ex- 

 pansions which usually occur in rapid succession. 

 The nucleus and the yellowish colour of the plasma 

 due to large numbers of minute, coloured grains, are 

 characteristic. 



* N., E., and W. Yorkshire signify the North, East, and West Ridings. 



