No. 2.] CLEAVAGE OF ARENICOLA CRISTATA. 85 



LITERATURE. 



'97a. ANDREWS, G. F. Some Spinning Activities of Protoplasm in Star- 

 fish and Sea-urchin Eggs. Journ. of Morph. Vol. xii, No. 2. 

 1897. 



'96a. CHAMPION, H. E. Experimental Studies on Gasteropod Develop- 

 ment. ArcJi.f. Entwickelungsmechanik, Bd. iii, Heft i. 1896. 



'97b. HAMMAR, J. A. Ueber eine allgemein vorkommende primare Pro- 

 toplasmaverbindung zwischen den Blastomeren. Arch. f. tnikr. 

 Anat. Bd. xlix, Heft i. 1897. 



'97c. HERTWIG, O. Zeitung und Streitfragen der Biologic. Heft 2. 

 Mechanik und Biologie. 1897. 



'95. LILLIE, F. R. The Embryology of the Unionidae. Journ. of 

 Morph. Vol. x, No. I. 1895. 



'94. MEAD, A. D. Preliminary Account of the Cell Lineage of Ampht- 

 trite. Journ. of Morph. Vol. ix, No. 3. 1894. 



'81. VEJDOVSKY, F. Untersuchungen iiber die Anatomie, Physiologic 

 und Entwickelung von Sternaspis. Separat. aus dem xliii. Bd. 

 der deutsch. math.-naturwiss. Classe d. kais. Acad. d. Wiss., 

 Wien. 1 88 1. 



'93b. WHITMAN, C. O. The Inadequacy of the Cell-theory of Develop- 

 ment. Journ. of Morph. Vol. viii, No. 3. 1893. 



'92. WILSON, E. B. The Cell Lineage of Nereis. Journ. of Morph. 

 Vol. vi, No. 3. 1892. 



'93a. WILSON, E. B. Amphioxus and the Mosaic Theory of Develop- 

 ment. Journ. of Morph. Vol. viii, No. 3. 1893. 



'96b. WILSON, E. B. Appendix to '96a. On Cleavage and Mosaic 

 Work. Arch. f. Entivickelungsmechanik. Bd. iii, Heft i. 1896. 



