302 N. M. Stevens. 



6. No connection between this 'besondere Korper' and the 

 secondary accessory fertilization cell could be traced. 



7. The two accessory cells with the fertilization canal are found 

 in all of the species studied (5), and have been observed in living 

 specimens. 



8. The author confirms Elpatiewsky's conclusions as to the 

 'besondere Korper' in the primary germ cells, and also as to the 

 probability that the division which produces two germ cells is 

 the differential mitosis. 



9. The granules and network found on the inside of the nuclear 

 membrane of immature oocytes appear not to be mitochondria, 

 but material derived from the chrom.osomes of the very young 

 oocytes. Whether this is waste material or material which func- 

 tions in connection with the growth of the oocytes is an open 

 question. 



10. All of the species examined have nine chromosomes in the 

 spermatocytes, one of which sometimes behaves like an equal 

 heterochromosome bivalent. The precocious division of this 

 chrom.osome is very striking in some individuals and entirely 

 absent in others. 



Accepted by The Wistar Institute of Anatomy and Biology, May 6, 1910. Printed August 4, 1910. 



