THE KANSAS UNIVERSITY 

 SCIENCE BULLETIN. 



VOL. IX, No. 18.] SEPTEMBER, 1915. [vl HO xix SE ^ E f 8 



A Study of Germ Cells of Corymorpha palma. 



LUCIE M. MARCH. 



Pates LI-LIII. 



(Contribution from the Zoological Laboratory, No. 217.) 



INTRODUCTION. 



THE problem which is here described was undertaken at the 

 suggestion of Dr. Bennet M. Allen, to whom I am indebted 

 for assistance and guidance throughout the entire extent of the 

 work. Originally, the problem was to discover the origin and 

 path of migration of the germ cells of Corymorpha, but, as 

 observations accumulated, it has enlarged itself to include the 

 formation and development of the medusa, particularly the 

 formation of that part called by Weismann the "glockenkern," 

 which has not been worked out in any detail before. While 

 the problem of the origin is not completely settled here, the 

 germ cells have been traced to a point beyond which they can 

 not be followed, owing to the limitations of the material at 

 hand and the methods of technique. 



LITERATURE. 



A vast amount of work has been done upon the germ cells 

 of coelenterates. An excellent review of the results and in- 

 terpretations of various workers has been given by Hegner in 

 his recent book on "The Germ-Cell Cycle in animals," so it 

 will be unnecessary to devote any space here to the discussion 

 of the general problem. 



Received for publication June 10, 1915. 



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 2 — Univ. Sci. Bull., Vol. IX, No. 18. 



