This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Biologische Untersuchungen TAF. VII . GUSTAF RETZI Ober den Bau des Kies dor Echinodermen etc bwi unt iv Taf VII ' ' Gez Retzlus Repr und Druck von Cederqulsts Graf Sthlm TAF VII Illustration XV biodiversitylibrary org title Frst Carl Magnus Retzius Gustaf Stach Wilhelm Biodiversity Heritage Library Biologische