AMONG SIMPLE BARCODE OKGANISMS. 271 



one another at different angles so as to enclose funnel-shaped 

 cavities with their mouths turned outwards. 



Fig. 4. 



Pia/copiis ruber, with its membranous pseudopodia enclosing eup-shaped cavi- 

 ties ; multitudes of vermilion-coloured corpuscles scattered through its proto- 

 plasm. (After P. E. Schulze.) 



The body is differentiated into a hyaline, refringent, cortical 

 layer, from which the pseudopodia are formed, and an internal 

 parenchyma in which granules, usually of a cinnabar or brick-red 

 colour, though occasionally green, are imbedded. 



The parenchyma contains also one or more nuclei, whose posi- 

 tion changes, as in the true Amoeba, with the movements of the 

 animal. The nucleus encloses a relatively large nucleolus. 



Finally round vacuoles in variable number and of different 

 sizes are scattered through the parenchyma, and may sometimes 

 be seen to have passed into the pseudopodia. Their pulsation is 

 not always manifest. 



Schulze has not succeeded in demonstrating any decided fact 

 regarding the reproduction of this curious rhizopod. 



Grreeff gives the name o^ Pelomyxa palustris (fig. 5) to an amoe- 

 boid organism which he discovered spreading over the bottom of 

 stagnant pools, first in the neighbourhood of Bonn and afterwards 

 at Marburg*. It isusually in the condition of little, slimy, blackish 

 sarcode masses, which may attain a diameter of even two milli- 

 metres. It is capable of great change of shape during its active 

 amoeboid movements, which are effected by the extension of its 

 periphery into thick lobes or hemispherical projections, or by con- 

 tinued undulations of its surface. 



* Arch. f. mikr. Anat. vol. x. 1874. The name of Pelobius, which he had first 

 assigned to it, had been already given to an aquatic beetle, and was therefore 

 changed by Greeff into Pelomyxa. ■• 



