DINAMCEBA. 



GENUS IY. DINAMCEBA. 



Animal of essentially the same structure as Ammba, 

 spheroidal or oval when at rest, ovoid or slug-like when 

 in motion, with the broader extremity in advance. 

 Pseudopods few or many, mostly simple, subulate or long, 

 conical and acute, occasionally furcate. Posterior 

 extremity of the body papillose ; papillae variable, few or 

 many, simple or compound, retractile. Surface of the 

 body, pseudopods and papillae bristling with minute 

 spicules or motionless cils. Body often enveloped with 

 a thick layer of hyaline jelly, with minute, imbedded 

 spicules. Spicules of the body and of the jelly some- 

 times absent. 



mirabilis. SYN. : Deinamceba mirabilis, Leidy ; 

 A. tentaculata, Leidy; Dinamceba, Leidy. 



Body round, oval, ovate or slug-like, more or less 

 depressed, anteriorly broad and blunt, posterior part more 

 narrow and more or less tapering ; spheroidal while float- 

 ing. Pseudopods usually numerous, and usually anterior, 

 moderately long, conical or fusiform. Posterior extremi- 

 ty of the body papillose. Surface of body, pseudopods 

 and papillae, thickly bristling with cils, which may be 

 absent in some conditions. Nucleus and contractile 

 vesicle usually obscured by other constituents. The large 

 proportion of ectosarc reminds one of A. verrucosa. In 

 size, form, and some other respects, it resembles Pelomyxa 

 villosa, but in Dinamceba the pseudopods are numerous 

 while they are not so in Pelomyxa. Like the latter it is 

 very voracious. Its favorite food seems to be desmids, 

 and it commonly occurs with Didimoprium and Bam- 



