Die Eifurchung von Herpobdella atoraaria Carena. 287 



1878. Whitman, C. 0., The embryology of Clepsine, in: Quart. Journ. 



microsc. Sc. (N. S.), Vol. 18. 

 1887. — , A contribution to the history of the germ layers in Clepsine, in : 



Journ. Morphol., Vol. 1. 



1890. Wilson, E. Embryology of the Earthworm, ibid., Vol. 3. 



1891. — , The origin of the mesoblast-bands in Annelids, ibid.. 

 Vol. 4. 



1892. — , The cell lineage of Nereis, ibid., Vol. 6. 



1898. — , Considerations on cell lineage and ancestral reminiscense 

 based on a reexamination of some points in the eai'ly development 

 of Annelids and Polyclads, in: Ann. New York Acad. Sc, Vol. 11. 



