You can feel hints of the same ideas in the writing of Lovecraft and Howard's Conan books (and sorta Tolkein). On a different level but similar is some of the great Szukalski's work. Pseudo-scientific analysis of anatomy and its relationship with ethnicity was a hot topic right into the early 20th century.
nope..I have the book this came from. some french 18th 0r 19th century guy drew 'different animal types' found in human physigionomy. like..early phrenological drawings..to prove that various social castes resembled a hierarchical order of animal types.