8 PELOMYXA. 



which is prehensile and often finely villous. Ecto- 

 sarc clear; eridosarc finely granular, containing vacuoles 

 and colorless globules. Nuclei numerous, scattered. 

 Contractile vesicles small and inconspicuous, except in 

 young forms. Voracious, usually gorged with vegetal 

 matter, with mud and sand. 



villosa. SYN. : A. sabulosa, Leidy. 



Almost opaque, except when young. By transmitted 

 light, brown or black, with hyaline border, yellowish- 

 white or cream-colored, and maculated with other colors, 

 according to the food ; spheroidal or ovoidal in the resting 

 condition ; clavate or botuliform when in motion, with 

 a terminal, sucker-like, villous patch ; villi numerous, min- 

 ute, papillary or filiform, simple or ramose. Pseudopods 

 usually one or two broad, lobal, anterior projections, rarely 

 prolonged or branching, sometimes accompanied by a 

 few narrow, conical processes of clear ectosarc from any 

 part of the body. Nuclei numerous, scattered. Contrac- 

 tile vesicles numerous, small. This species closely resem- 

 bles^.. vittosa, and it is difficult sometimes to determine to 

 which of the two species a given form belongs. However, 

 the A. villosa is usually more distinctly elongated or 

 clavate in shape, and the pseudopods are rather more 

 slender than in Pelomyxa, while the villous process 

 is always present. In the latter the villi may be very 

 inconspicuous or even quite drawn in, and it is provided 

 with several small nuclei, not with a single large one 

 like A. villosa. Sand-grains are not conspicuous in 

 A. villosa. Size, while at rest, from 120// to 1,250/4, but 

 commonly from 250 ( to 500/z ; when elongated, from 

 120/; by 60^ to 600 by 220/t, or larger. 



