Title: Zöology; a textbook for colleges and universities
Year: 1920 (1920s)
Authors: Cockerell, Theodore D. A. (Theodore Dru Alison Cockerell), 1866-1948
Subjects: Zoology
Source book page: https://archive.org/stream/zologytextbook00cock/zologytextbook00cock#page/n418/mode/1up
Source: https://commons.wikimedia.org/wiki/File:Z%C3%B6ology;_a_textbook_for_colleges_and_universities_(1920)_(14757113916).jpg