4 8 



GARY N. CALKINS. 



without evidence of further advance. In one specimen (Fig. 5), 

 a group of terminal satellites, evidently the result of this phase 

 of activity in two branched terminal chains, were present. Ulti- 

 mately, division planes appear in the cytoplasm around each of 

 the four nuclei, and four naked cells are produced. The fate 

 of these cells is not known; possibly theyjbecome new primites 



and repeat the cycle, but more probably, they are gametes 

 which unite to form sporoblasts characteristic of the gregarines. 

 I shall try to work out their further history during the coming 

 June. 



This rather paradoxical organism has given me a great deal of 

 trouble. Is it a metazoon or a protozoon? Is the "individual" 

 the entire chain or is it a chain of individuals? Although the 

 aggregate has a definite morph and a definite ontogeny I am 

 inclined to regard it as a chain of individuals in which original 

 reproduction by division has become modified to asymmetrical 

 division or budding in the primite, but is retained by the satel- 

 lites. Originally, it may be assumed, the daughter individuals 

 became separated and after a few divisions finally gave rise to 



