INTRODUCTION 



37 



In this connection we have to do only with the multinucleated and 

 with the colonial forms of Protozoa, for in ordinary division the 

 daughter cells separate completely and reproduction has no effect 

 on the form assumed. Thus the foraminiferon Allogromia oviforme 

 gives rise by what is termed budding division to a free daughter 



L-__/ 



M-— 





*i — m 



Fig. 17 



Fig. 18 



Fig. 17. — A bilaterally symmetrical flagellate, Giardia muris Grassi. AX, axostyle; 

 B, blepharoplast; BB, basal body; C, centriole; E, endosome; N, nucleus; PL, 

 parabasal body; RH, rhizoplast. (After Kofoid and Swezy.) 



Fig. 18. — A bilaterally symmetrical ciliate from Uroleptus mobilis. A double 

 individual formed by fusion of two individuals after conjugating. With two mouths 

 and adoral zones (a. z.); two sets of cirri (/); and two sets of macronuclei (M) and 

 micronuclei (m). For structure of single individual see Frontispiece. (Original.) 



cell which builds an independent test for itself while the other cell 

 remains in the old test. In other forms of Foraminifera, however, 

 the bud of protoplasm does not become separated from the parent 

 bulk of the cell but takes a position in relation to the other portion 

 which possibly depends upon the physical conditions of the proto- 



