460 Beard. — Reproduction in Animals and Plants. 
1. A to C. Two divisions of micronuclei leading to spore- 
formation (c) and reduction. Atrophy of seven of the eight 
2 . D. Fission of the spores 
or sporozooids to form like 
gametes (d). 
3. E. Conjugation of the 
gametes (e). 
4- /, g, and h. Formation 
and differentiation of new 
individuals from the zygote 
by fission consequent on con- 
jugation. 
Paramecium caudatum 
(woodcut 11). Prior to conju- 
gation there are, as in P. 
aurelia , two divisions of the 
micronucleus, which is here 
single. 
1. B, C. Two divisions 
resulting in the formation of 
four spores (c) and reduction. 
Abortion of three spores. 
2 . D. Fission of the spore-individuals to form like gametes. 
3. Conjugation (e) of the gametes. 
4. F to H. Fission leading to the formation and differentia- 
tion of new individuals subsequent to conjugation, but with 
Q 
abortive individuals or nuclei (macro- or micronuclei after — 
at h) \ 2 
Onychodromus grandis (woodcut 12 ). The conjugation 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-formation and reduction, aborts (b ) 3 . 
1 Probably micronuclei. 
2 Maupas, E., loc. cit, pp. 238-263. 
3 Abortion of virtual spore-daughter-cells. 
1st. fission 
Woodcut 10. 
Paramecium aurelia (after Maupas.) 
