140 



PROTOZOOLOGY 



cyclopum in which the entire body, excepting the stalk and 

 pelHcle, transforms itself into a young ciliated bud which leaves 

 sooner or later the parent pellicle as a swarmer. 



Plasmotomy. Occasionally the multinucleate body of a proto- 

 zoan divides into two or more small, multinucleate individuals, 



.•:-if.<-Joi-;.(>i 



V-.f(t«i'?»-».-. 



pa 



Mm 



'l^ 





Fig. 65. a, b, budding in Myxidium lieberkuhni; c, d, plasmotomy 

 in Chloromyxum leydigi; e, plasmotomy in Sphaeromyxa halbianii. 



the cytosomic division taking place independently of nuclear 

 division. This has been called plasmotomy by Doflein. It has 

 been observed in the trophozoites of several coelozoic myxo- 

 sporidians, such as Chloromyxum leydigi (Fig. 65), Sphaeromyxa 

 halbianii (Fig. 65), etc. It occurs further in Mycetozoa (Fig. 135), 

 Foraminifera and ProtociHata. 



Colony formation 



When the division is repeated without a complete separation 

 of the daughter individuals, a colonial form is produced. The 



