GENUS PELOMYXA— PELOMYXA VILLOSA. 79 



notice, in the more characteristic or matured specimens of Pelomyxa villosa. 

 In some young amoeboid forms, which I suspected to pertain to the latter, 

 crystals undoubtedly existed, and perhaps they are likewise abundant 

 enough in mature forms, but ordinarily are obscured from view by the 

 presence of the large proportion of sand particles. Prof. Greeff does not 

 mention them as an element of Pelomyxa palustris. 



The basis of the endosarc of Pelomyxa villosa, as in the latter, consists 

 of a pale and finely granular protoplasm, mingled with more distinct fine 

 oil-like molecules. Besides the food materials and other ingesta, the endo- 

 sarc contains a variety of other elements. Among these there are variable 

 proportions of clear vacuoles, sometimes numerous, sometimes few, of dif- 

 ferent sizes. 



Another element consists of clear or indistinctly granular corpuscles 

 of albuminoid or oleaginous appearance, mostly colorless, but sometimes 

 more or less feebly yellowish. They range from a small size up to 0.006 

 mm., though the prevailing size was about one-half this dimension. Under 

 the action of acetic acid they mostly remained unchanged, though many 

 became more distinctly granular, and less distinctly outlined. These 

 corpuscles probably correspond with the 'sarcoblasts' of Amosba villosa of 

 Dr. Wallich, and the 'Glanzkorper' or shining corpuscles of Pclomyxa palus- 

 tris of Prof. Greeff. 



Mingled with the clearer corpuscles just indicated, there were others, 

 comparatively fewer, and measuring about 0.004 mm. These were more 

 or less homogeneous, with scattered granules superficially situated. Still 

 other corpuscles, about the same size as the preceding, were finely granular, 

 and contained a darker granular nucleolus. I am uncertain whether these 

 corpuscles correspond with the nuclei of Pelomyxa palustris as described by 

 Prof. Greeff. 



In some crushed specimens of the variety of Pelomyxa villosa, origi- 

 nally noticed by me under the name of Amoeba sabulosa, I further noticed 

 a few comparatively large granular spheres reaching about 0.016 mm., and 

 containing each several scattered nucleoli, some of which appeared clear 

 and homogeneous, while others were granular. 



In several instances, in crushed specimens of Pclomyxa villosa, I also 

 observed, as one of the constituents of the endosarc, numerous minute rods, 

 from 0.001 to 0.005 mm. in length, and resembling vibrios, but motionless 



