494 H. L. Wieman. 



fact that the germ cells are provided with a source of nutrition 

 as long as they remain in the cysts, suggests that if the degener- 

 ative process is for the purpose of producing a nutritive substance 

 for the germ cells, this substance is used only after they have been 

 discharged from cysts as mature spermatozoa into the central 

 cavity of the testis and the sperm ducts. 



BIBLIOGRAPHY 



Demokidoff, K. Zur Kenntniss des Baues des Insectenhodens. Zool. Anz., 



1902 Bd. 25. 



Grunberg, K. XJntersuchungen iiber die Keim und Nahrzellen in den Hoden 



1903 und Ovarien der Lepidopteren. Zeit. wiss. Zool., Bd. 74. 



Wallace, L. B. The spermatogenesis of Agalena naevia. Biol. Bull., vol. 



1909 17. 



Wieman, H. L. A study in the germ cells of Leptinotarsa signaticoUis. Jour. 



1910 Morph., vol. 21, no. 2. 



