CLEAVAGE IN THE EGG OF CEREBRATÜLUS. 19 



Morgan, T. H., an^ Lyon, E. P., '07.— Tiie relation of the substances of 



the egg, separated by a strong centrifugal force, to the location of 



the embryo : Arch. Entm. 24. 

 Wilson, C. B., '00 — The habit and early development of Cerehratulus 



lacleus: Qnart. Jonrn. 43. 

 Wilson, E. B., '03. — Experiments on cleavage and localization in the 



nemertiue egg : Arch. Entm. 14. 

 „ '04.— Experimental studies on germinal localization. I. The 



germregions in tlie egg of Dentalium: Jonrn. Exp. Zool. 1. 

 Yatsu, N., '04. — Experiments on the development of egg fragments in 



Cerehlatulus : Biol. Bull. 4. 

 ,, '08. — Some experiments on cell-division in the egg of Cerehratulus 



lacieMS'. Annot. Zool. Japon. 6. 

 Zeleny, C, '04. — Experiments on the localization of developmental factors 



in the nemertine egg : Jonrn. Exp. Zool. 1. 

 ZiEGLER, H. E., '98 — Experimentelle Studien über die Zelltheilung (Fort- 

 setzung) III Die Furchungszellen von Beroë ovata : Arch. Entm. 7. 

 Zur Strassen, 0., '06. — Die Geschichte der T-Riesen von Ascaris megaloce- 



phala als Grundhxge zu einer Entwickelungsmechanik dieser Species: 



Zoologica. 17. 



