6 OUBAMCEBA. 



careful watching, the form may be observed to change 

 very slowly, and the pseudopods to contract or elongate, 

 or to bend or twist. 



When creeping, of a less radiate character, but with 

 pseudopods diverging mostly from one extremity in the 

 direction of the movement. Contractile vesicle single, or 

 several smaller ones. Nucleus usually distinct. Size, 

 12^ to 45/*, rarely QO/J. in diameter; pseudopods 80// 

 long. 



A. Vlllosa. SYN. : Amoeba, Wallich ; A. villosa, Wallich ; A. 

 princeps, Carter ; Trichamceba hirla, Fromentel. 



Animal in motion differentiated into an anterior and 

 posterior region, sausage-shaped, irregularly clavate or 

 palmate, and commonly with few lobate, or short, thick, 

 digitate or conical pseudopods, mostly directed forward ; 

 posterior extremity commonly narrower, terminating in 

 a villous process of variable form, usually rounded, knob- 

 like or discoid. Endosarc, contractile vesicle and nucleus 

 as in A. proteus. Size as large as 503/*. 



No positively characteristic forms of this species have 

 been observed in this country. The villous portions re- 

 semble protrusions of the endosarc. 



GENUS II. OUKAMCEBA. 



Animal possessing the same essential characteristics as 

 the genus Amceha, but provided with fixed filamentous ap- 

 pendages habitually trailing from the posterior extremity 

 of the body. Filaments flexible, cylindrical, tubular, 

 inarticulate or articulate, resembling mycelial threads of 

 fungi, perfectly passive. 



