"Nobel Coral" from Brehms Tierleben.
Biodiversity Heritage Library, Public domain via Flickr: https://flic.kr/p/2m7dFwx
Color and cropping edits.
n225_w1150
Brehms Tierleben Leipzig,Bibliographisches Institut,1911-19- biodiversitylibrary.org/page/32633807Flickr