Ernst Haeckel,
Adolf Giltsch
Tubuletta. / Tubulariae. Röhrenpolypen.
Lithograph by Ernst Haeckel and Adolf Giltsch
Plate 6 from Kunstformen der Natur. Tubulariae: Genus of Hydroids, animals related to jellyfish and have strong visual similarities to them such as a compact, mostly round body with long strings...