249 



2) B. Fission of the spores or sporozooids to form like gametes {d). 



3) E. CoDJugation of the gametes (e). 



4) f , g and h. Formation and ditferentiation of new individuals 

 from the zygote by fission consequent on conjugation. 



Fig. 3. 



Paramecium caudatum (Fig. 3). Prior to conjugation there 

 are, as in P. aurelia, two divisions of the micronucleus , which is 

 here single. 



1) B — G. Two divisions resulting in the formation of four spores 

 (c) and reduction. Abortion of three spores. 



2) B. Fission of the spore individuals to form like gametes. 



3) Conjugation (e) of the gametes. 



4) F — H. Fissions leading to the formation and differentiation of 

 new individuals subsequent to conjugation , but with abortive 



individuals or nuclei (macro- or micronuclei after „ at h) ^). 



Onychodromus grandis (Fig. 4 after Maupas). The conju- 

 gation here, as made out by Maupas 2) in a fashion that can only excite 

 admiration, is exceedingly interesting and complicated. There are two 

 micronuclei, and of these one, after commencing the steps leading to spore- 



1) Probably micronuclei. 



2) E. Maupas, loc. cit. p. 238 — 263. 



