- 66 — 



Fig. 21. Type E, witli uumerous food inclusions. Comp. ocul. 6; obj. 

 Zeiss 4 mm. 



Fig. 22. Type C; tlie nucleus with elongated karyosome. at the ends of 

 which chromatin is collected; the contents of the nucleus are often detached 

 from the membrane; close to the nucleus is a small undulating membrane. 



Fig. 23. Type D. The beginning of nuclear division. The spindle outside 

 the nucleus with centrioles at the ends is well seen. 



Fig. 24. Idem. The spindle consists of fibres twisted in the manner of 

 a rope: inside the nucleus there are collected masses of chromatin (products 

 of metabolism of the karyosome). 



Fig. 25. Type C. A section through the body- wall; it is clearly seen 

 that the undulating membrane (m) projects above the surface of the body. 



Fig. 26. Type D. The beginning of nuclear division; the nucleus is fil- 

 led with numerous round chromosomes. 



TABLE III. 



All the drawings are made with the magnification: compens. ocul. 6, ob- 

 ject, immersion Zeiss 2 mm. 



All the drawings represent Myxomonns polymorpha; all of them, ex- 

 cept fig. 38, refer to forms of type D; fig. 38 represents an individual of 

 type F. 



Fig. 27. Dividing individual; from one pole of the spindle a thread runs 

 (a rudiment of the old membrane or the beginning of the formation of a 

 new one). 



Fig. 28. Idem. The daughter-nuclei after division have assumed the 

 state of resting nuclei; between the nuclei is the bent spindle. 



Fig. 29. An individual with fully formed large membranes. 



Fig. 30 — 37. Different stages in the division of the nucleus in the forms 

 of type D\ w— formation of undulating membrane. 



Fig. 38. An individual of type F. 



Fig. 39. The formation of large membranes in an individual of type D. 



TABLE lY. 



All the drawings, except fig. 41, are made with the magnification: compens. 

 ocul. 6; objekt. immersion of Zeiss 2 mm. All the drawings represent My- 



xomonas polyviorpha. 



Fig. 40. An individual of type C preparing for encystment; the endo- 

 plasm is filled with chromidia. 



Fig. 41. An individual of type E breaking up into plasmatic balls; the for- 

 mation of individuals of type F from it. Ocul. 6, object, of Zeiss 4 mm. 



Fig. 42. An uninucleate amoeba; as it seems, having just finished the 

 division; a half of the divided spindle is visible {ax). 



Fig. 43. The nucleus of a small uninucleate amoeba, just after division, 

 as it seems. Fr^m the nucleus there passes a piece of the spindle torn off, 

 and a small rudiment of the undulating membrane is closely apposed to the 

 nucleus. 



Fig. 44. Nucleus of an individual of type C 



