25O MARY BLOUNT. 



4. Cells are added to the blastodisc from the marginal and 

 central periblast. 



5. The "free nuclei" under the blastodisc are periblast nuclei. 

 They are the nuclei of the germ wall, including the Randzvulst. 



LITERATURE. 



1. Agassiz and Whitman, C. 0. 



'84 On the Development of some Pelagic Fish Eggs. Preliminary Notice. 

 Proc. Amer. Acad. Arts and Sciences, XX., 1884. 



2. Eycleshymer, A. C. 



'03 The Early Development of Lepidosteus Osseus. The Decennial Publica- 

 tions, Univ. of Chicago, X., 1903. . 



3. Harper, E. H. 



'04 The Fertilization and Early Development of the Pigeon's Egg. Am. Jour. 

 Anat, Vol. III., No. 4, pp. 349-386, Sept., 1904. 



4. His, Wilhelm. 



'75 Der Keimwall des Huhnereies und die Entstehung der parablastischen Zel- 

 len 1875. Zeitschrift fur An. u. Entwgesch., Bd. I., S. 274 ff. 



5. His, Wilhelm. 



Lecithoblast und Angioblast der Wirbelthiere. Abhandlungen der Konigl. Sachs. 

 Gesellschaft der Wissenschaften. Math.-Phys., XXVI. 



6. Kolliker, Albert von. 



'79 Entwicklungsgeschichte des Menschen und der Hoheren Thiere. Leipzig, 

 1879. 



7. Patterson, J. Thos. 



'07 On Gastrulation and the Origin of the Primitive Streak in the Pigeon's Egg. 

 — Preliminary Notice. Biol. Bull., Oct., 1907. 



8. Wilson, H. V. 



'gi The Embryology of the Sea Bass (Serranus Atrarius). Bull. U. S. F. C., 

 Vol. 9, pp. 209-277 (1891). 



