PLATE 4 



Fig. 22. Late anaphase, showing formation of new eytostomes. Note 

 length of paradesmose. 



Fig. 23. Multiple fission with beginning of the third division of nucleus. 



Fig. 24. Small individual apparently about to encyst. 



Fig. 25. Multiple fission with nuclei in preparation for second division. 



Fig. 26. Encysted form which has divided. Note structure of cyst wall. 

 X 1250. 



Fig. 27. Encysted form showing outer surface of cyst only. X 1250. 



Fig. 28. Somatella of si.x zooids formed by multiple fission. Full complement 

 of flagella, parabasals, undulating membranes and nuclei. 



Fig. 29. Dividing individuals just escaped from cyst. 



Fig. 30. Product of multiple fission. Note relatively enormous length of 

 parabasal. 



Fig. 31. Encysted form with single nucleus. 



Fig. 32. Individual following excystment. 



Fig. 33. Small form dividing. Note relative lengths of parabasals. 



Fig. 34. Late anaphase of binary fission. 



Fig. 35. Second division of nucleus in multiple fission. 



Fig. 36. Telophase of binary fission. 



[40] 



