Jolivette—Spore Formation. 
1185 
like that in the lesser pseudopodia. Here we have an example 
of the origin of rajs and cilia by growth from a common 
center. The strong resemblance in appearance of the two as 
well as the numerous stages of transition point to a strong simi¬ 
larity between the polar rays and the cilia, and this is further 
confirmed by the generally accepted origin of the axile thread 
of the flagella of the spermatozoa from the centrosome in 
amphibia and othet animals. 
******* * 
This work was done at the suggestion of Dr. R. A. Harper to 
whom I am indebted for many valuable suggestions and criti¬ 
cisms. 
4—3. & A. 
