304 W. SonLerr, 
Wırson, E. B., 1890, Embryology of the Earthworm, ibid., Vol. 3. 
—, 1892, The cell-lineage of Nereis, ibid., Vol. 6. 
, 1898, Considerations on cell lineage and ancestral reminiscence, in: 
Ann. New York Acad. Sc., Vol. 11. 
—, 1904, Experimentals studies on germinal localization. 1. The germ- 
regions in the egg of Dentalium, in: Journ. exper. Zool., Vol. 1. 
ZIEGLER, H. E., 1895, Untersuchungen über die ersten Entwicklungs- 
vorginge der Nematoden, in: Z. wiss. Zool., Vol. 60. 
