Image: haeckel calcispongiae

Calcispongiae:
Ascandra pinus (Haeckel) = Leucosolenia complicata (Montagu, 1818), habitus
Ascandra sertularia (Haeckel) = Leucosolenia sertularia (Haeckel, 1872), habitus
Ascilla gracilis (Haeckel) = Guancha gracilis (Haeckel, 1872), habitus
Syculmis synapta (Haeckel) = Amphoriscus synapta (Schmidt in Haeckel, 1872), rooting spicule (genus Amphoriscus)
Syculmis synapta (Haeckel) = Amphoriscus synapta (Schmidt in Haeckel, 1872), rooting spicule (genus Amphoriscus)
Sycurus primitivus (Haeckel) = Sycettaga primitiva (Haeckel, 1872), habitus (cut open) (genus Sycettaga)
Sycodendron ampulla (Haeckel) = Sycon ampulla (Haeckel, 1870), habitus (genus Sycon)
Sycarium elegans (Haeckel) = Sycon elegans (Bowerbank, 1845), habitus (cut open) (genus Sycon)
Sycortis quadrangulata (Haeckel) = Sycon quadrangulatum (Schmidt, 1868), lengthwise section of body wall (genus Sycon)
Sycandra compressa (Haeckel) = Grantia compressa (Fabricius, 1780), skeleton of wall tube
Sycarium elegans (Haeckel) = Sycon elegans (Bowerbank, 1845), lengthwise section of body wall (genus Sycon)
Sycaltis perforata (Haeckel) = Amphoriscus perforatus (Haeckel, 1872), lengthwise section of body wall (genus Amphoriscus)
Sycetta strobilus (Haeckel) = Grantia strobilus (Haeckel, 1872), habitus (genus Grantia)
- from the book sets: Art Forms in Nature (Kunstformen der Natur) - by Ernst Haeckel (1899-1904).

- من صور كتب: النماذج الفنية في الطبيعة، لـ إرنيست هيكل (نشر ما بين 1899-1904 م.)