326 Dr. A. Gruber on Protozoa. 



more than an irregular mass of granules was to be seen. 

 These, however, were held together by the pseuclopodia of the 

 large individual ; a capsule of protoplasm formed around the 

 mass of ruins j and it was then gradually drawn into the body 

 of the ActinophryS) into which it had soon completely passed. 



EXPLANATION OF PLATE XIII. 



(This plate contains only a selection from the numerous figures given 



by Dr. Gruber. His numbers are given in parentheses.) 



Figs. 1-4. Pachymyxa hystrix. 



Fig. 1 (1). A middle-sized Pachymyxa with extended pseudopodia, alive. 



We see the litth mcilli of the envelope which give the Khizo- 

 pod a brown colour by transmitted light. Regularly distributed 

 over the surface are the pores for the issue of the processes. 



Fig. 2 (4). A living specimen which has rolled itself spirally in the 



middle part. Pseudopodia issue from the two extremities. 



Fig. 3 (6). A small portion of the surface of a Pachymyxa killed with 



osmic acid and stained with picrocarmine. The protoplasm 

 shows two layers — an inner lighter one, with granules and nu- 

 cleiform bodies, and an outer hyaline deeply stained one, from 

 which the pseudopodium issues. 



Fig. 4 (7). The supposed naked variety of Pachymyxa hystrix. Two 



specimens fused together, living ; the larger is absorbing the 

 nutritive mass of the smaller one. The larger one is characterized 

 by the sharp separation of an outer and an inner layer of proto- 

 plasm and by the regularity of the former. At the periphery 

 pseudopodial cones with pseudopodia appear at uniform dis- 

 tances apart. 



Fig. 5 (12). An Amoeba obtecta, living, in its brownish envelope, from the 



orifice of which pseudopodia issue. 



Fig. 6 (17). Stichotricha, sp. The extremity of a filamentous colony 



with a great number of Infusoria which project from the gela- 

 tinous mass. 



Fig. 7 (22). Stwhotricha umula. A specimen in its flask -shaped carapace, 



with the anterior part of the body prolonged into a neck. At 

 the peristome the membranous seam is distinctly perceived. 



Fig. 8 (31 ). A large vesicle of Spongomonas guttata of the natural size. 



Fig. 9 (Lib). A large and a small Actinophry* artificially brought to- 

 gether, with the pseudopodia mingling. The union has com- 

 menced, a plasma-bridj extending between the fcwo individuals. 



Fig. 10(42), An Aetinophrys which has taken up three small indivi- 

 duals, two of which are still visible ; besides these it lias taken 



in some green food-particles. 



