GERM CELLS OF COELENTERATES 93 



LITERATURE CITED 



Beckwith, Cora J. 1909 Preliminary report on the early history of the egg 

 and embryo of certain hydroids. Biol. Bull., vol. 16, pp. 183-192. 



191-4 The genesis of the plasma-structure in the egg of Hydractinia 

 echinata. Jour. Morph., vol. 25, pp. 189-251. 



GoKTTE, A. 1907 Vergleichende Entwicklungsgeschichte der Geschlechtsindi- 

 viduen der Hydropolypen. Zeitschr. f. w. Zool., vol. 87, pp. 1-335. 



Hargitt, C. W. 1906 The organization and early development of the egg of 

 Clava leptostyla Ag. Biol. Bull., vol. 10, pp. 207-232, 



Hargitt, George T. 1909 Maturation, fertilization and segmentation of Pen- 

 naria tiarella (Ayres) and of Tubularia crocea (Ag.). Bull. Mus. 

 Comp. Zool., Harvard College, vol. 53, pp. 161-212. 



1913 Germ cells of Coelenterates. I. Campanularia flexuosa. Jo\ir. 

 Morph., vol. 24, pp. 383-419. 



H.\RM, K. 1903 Die Entwicklungsgeschichte von Clava squamata. Zeitschr. 

 f. \v. Zool., vol. 73, pp. 115-165. 



Weismanx, a. 1883 Die Entstehung der Sexualzellen bei den Hydromedusen. 

 Jena . 



WuLFERT, J. 1902 Embryonalentwicklung von Gonothja-aea loveni Alhn. 

 Zeitschr. f. w. Zool., vol. 71, pp. 296-327. 



