90 H. B. GOODRICH 



tenization into parallel threads and thus enter the contraction 

 figure indicating a parasynapsis. 



10. A more intimate union of the paired threads in synapsis 

 is observed in the oogenesis than in spermatogenesis. 



11. Elimination of chromatin during cleavage occurs as in 

 Ascaris lumbricoides at the four cell stage rather than at the 

 two cell stage as in Ascaris megalocephala. 



In conclusion I should like to express my thanks to Dr. E. B. 

 Wilson for most helpful suggestions and advice during the 

 progress of the work and to Dr. E. G. Conklin and authorities 

 at Princeton University for aid and for facilities afforded dur- 

 ing the academic year 1914-15. 



FEBRUARY, 1916 



