52 GERM-CELL CYCLE IN ANIMALS 
the work of the above named investigators there were 
many who were not convinced that peedogenesis 
occurs in the genus, and the larve which were 
known to develop within the bodies of other larve 
were considered by these skeptics as parasites. How- 
ever, the results of Kahle’s (1908) studies, which have 
been decisively confirmed (Hegner, 1912, 1914a), 
have finally settled the question in favor of peedogen- 
esis. 
Previous to 1910 no specimens of the genus 
Miastor had been recognized in this country, but 
on Oct. 5 of that year, Dr. E. P. Felt found them in 
great abundance, living in the partially decayed 
inner bark and in the sapwood of a chestnut rail. 
With material supplied by Dr. Felt, the writer 
has been able to follow the entire keimbahn in these 
insects. Predogenetic reproduction normally oc- 
curs during the spring, summer, and autumn, multi- 
plication being arrested during the cold winter 
months. This method of reproduction is interrupted 
in midsummer by the appearance of male and female 
adults. 
The larva of Miastor possesses two ovaries, one on 
either side of the body in the tenth or eleventh 
segment. Each ovary (Fig. 12) consists of typically 
thirty-two odcytes (odc.n); these are inclosed in a 
cellular envelope (en). Associated with each odcyte 
is a group of mesoderm cells which function as nurse 
cells (n.c.) and together with the odcyte are sur- 
rounded by a follicular epithelium (f.ep). The 
nurse cells furnish nutrition to the growing odcytes, 
