INDIVIDUALITY OF GERM NUCLEI. 407 



one has observed this in rotifers previously nor have the two 

 nuclei been seen in as late stages as in this species of rotifer. 



Summary: It has been found in Asplanchna intermedia that 



the germ nuclei in the fertilized egg do not fuse in the early 



\.ige stages, but each gives rise to two sets of about 26 



rhronin-i.me-. one set of which pass into each of the daughter 



nuclei, l-ach nucleus is a structurally distinct vesicle. 



In later <lea\age stages the nuclei become fused so that in 

 alxint tin .-11 embryo only a very few show the two nuclei 



in nne cell. 



.ORATORIES, 

 OF NEBRASKA. 

 : s. NEBRASKA. 

 ember i. 1924. 



BIBLIOGRAPHY. 

 Beard, J. 



'02 rm Cells. I. Raja balis. Zool. Jahrb. 16. 



Conklin, E. G. 



'01 '1 In- In-lr. of the Germ-nuclei during the Cleavage of CrepiJiila. 



i .. Vol. II. 

 Httcker, V. 



'92 1 g bei Cyclops und Canthocamolus. Zool. Jahrb., Bd. V. 



Mark. F. I. 



'81 .V ii. Fecundation and Segmentation of Limax campestris. Bull. 



Zool.. Harvard College. VI. 

 Smith, Bertram G. 



'19 I!i. in.:. of the Germ-nuclei during the Cleavage of the Egg of 



.us alleghcnitnsi*. Biot. BULL., Vol. 37- 

 Tauson, A. 



'24 I >i. Ki -in:ir. --[irozessc der parthenogenetischen Eier von Asplanchna inter- 

 in < Zeit. f. Zcllen u. Gewebelehre, Bd. i. 

 Van Beneden, E. 



'83 1< :r la matuiation de 1'oeuf. la fecondation et 1 n cellu- 



\. Hiol.. I\'. 



