@book{bhlitem16761, title = {Lehrbuch der Zoologie }, copyright = {Public domain. The BHL considers that this work is no longer under copyright protection.}, url = {https://www.biodiversitylibrary.org/item/16761}, note = {https://www.biodiversitylibrary.org/bibliography/1695}, publisher = {Jena, G. Fischer, 1892}, author = {Hertwig, Richard Karl Wilhelm Theodor von Richard Karl Wilhelm Theodor von Hertwig Sir}, year = {1892}, pages = {606}, keywords = {Zoology|}, }