) 



'. 



Dr. A. Gruber on Protozoa. 269 



As I supposed, they issued from the pores of the envelope, 

 although this could not always be demonstrated with certainty. 

 In the figure, which is drawn from life, the pseudopodia are 

 seen only at the periphery ; and this is generally the case, 

 either because we cannot detect the pseudopodia issuing from 

 the upper surface, or because the overlying covering-glass 

 here stands in the way of an issue of the sarcode. 



As regards the form of the pseudopodia, it is such as to 

 indicate for Pachymyxa a position among the Lobosa. It 

 differs, however, from the ordinary form in that the pseudo- 

 podia are not lobate often- changing processes of protoplasm, 

 but threads of uniform thickness from the base (t. e. from their 

 point of issue) to the tip, and never exceeding a certain length, 

 which can bend slowly to and fro. They most resemble 

 those of Orbulinella smaragdea described by Entz *, as this 

 is reproduced by Biitschli in 'Bronn's Klassen und Ordnungen 

 des Thierreichs ' (Protozoen, Taf. iv. fig. 4). In this also 

 the pseudopodia issue from pores of the shell f. 



I have never observed any branching in the pseudopodia. 

 Usually they are all of equal thickness ; and only occasionally, 

 when the animal flattened itself, were broader processes seen 

 to issue from some points. No protoplasmic flow is observ- 

 able in the pseudopodia ; and they consist of perfectly hyaline 

 sarcode without any granules. They appear not to be organs 

 of locomotion ; for I have never observed that the Pachymyxa 

 effected any change of place by their means. The processes 

 evidently serve only to collect and convey to the body nutri- 

 tive materials. 



Unfortunately I have never succeeded in seeing the Pachy- 

 myxa take nourishment, and consequently can offer no explana- 

 tion of the fact that one sees in its interior food-balls which are 

 much too large to be incepted through the apertures of the 

 envelope. It is quite possible that substances originally finely 

 divided are afterwards balled together in the interior of the 



Rhizopod into such masses. 



As regards the protoplasmic body itself, this, even in the 



living animal, shimmers through the envelope ; and its contour 

 is seen to reach to the bacilli. At the points where pseudo- 

 podia issue the strong refractive power betrays a layer of 

 hyaline protoplasm, from which the processes are produced, 

 whilst within the body consists of a turbid sarcode abundantly 

 furnished with granules and vacuoles. It is likewise fre- 

 quently quite full of dark brown food- balls. The whole mass 

 is exceedingly tenacious and dense, so that scarcely any thing 



* Naturb. Hefte des ungar. Nat.-Mus. i. 



t Entz's memoir has unfortunately not been accessible to me. 



