ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 207 



Protozoa as the Meliozoa. In them reproduction takes place by 

 polysporogony ; in the Thecolobosa also the ordinary method of 

 reproduction is the generation of numerous germs in the entoplasm. 

 He endeavours to derive the buds observed by R. Hertwig in Acan- 

 thocystis aculeata from such internal spores as these whose existence 

 he assumes. Naturally, the formation of swarm-spores observed in 

 Actinophrys and Actinosplicerium by Greef and Archer appear to him 

 to support his explanation. He explains the feeble phenomena of 

 motion exhibited by Acanihocystis flava as not caused by the pseudo- 

 podia, but as due to the mobility of the skeletal elements and to 

 slight dislocations of the surface of the body. 



Dimorplia mutans.* — Dr. A. G-ruber regards this form as being 

 intermediate between the Flagellata and the Heliozoa ; he points' out 

 that the systematic position of the former has been a matter of much 

 difficulty, but that Stein is probably right in associating them 

 especially with the Infusoria. With regard to their mode of locomo- 

 tion, it may be pointed out that in the Protozoa we may have a 

 streaming of protoplasm, the action of flagella, or ciliary movement ; 

 there are no fundamental differences between these modes, and in 

 some cases more than one is to be seen in one individual ; among 

 these is the organism here described. At one moment appearing to 

 be an Amoeba radiosa, it suddenly seemed to shoot out a long flagellum 

 on one side ; the body then elongated and became oviform, while the 

 pseudopodia began to shorten : two flagella were now seen. After 

 moving about, it suddenly stopped, became spherical, and gave off 

 radially fine pseudopodia, so that it looked like a Heliozoon. The 

 cycle of change was again repeated, and was observed in numerous 

 specimens. 



The swimming movement is always connected with a rolling 

 round the long axis, which renders observation somewhat difficult ; 

 it was, however, possible to see that the margin of the body was often 

 quite smooth, so that it resembled a monad ; the protoplasm at the 

 anterior end is then much clearer and free from granules, while the 

 middle portion is dark and contains larger crystalline corpuscles. 

 The nutrient material is collected at the hinder end of the body. 

 There are always two flagella, arising near one another at the anterior 

 blunted pole. No mouth could be seen, and the dark protoplasm 

 completely obscured the nucleus. There is a large contractile 

 vacuole, but there is no cuticle. The pseudopodia would appear to 

 be what Engelmann has called myopodia, or to present a fibrillar 

 structure; when a spore of an alga is seized between two pseudo- 

 podia, it is almost immediately killed ; it is carried to the periphery 

 of the mass of the body and is seized by a broad protoplasmic process, 

 just as in an Amoeba ; as this may take place at two points of the body 

 simultaneously, it is clear that there is no part specially set apart for 

 the ingestion of nutriment. In four hours digestion is completed. 

 The general protoplasm is soft and not very consistent. On the 

 whole Dimorplia presents the characters of a true Heliozoon, but in 



* Zeitschr. f. wiss. Zool., xxxvi, (1881) pp. 445-59 (1 pi.) 



