Haeckel: Siphonophorae Staatsquallen. 1904. An original antique lithograph. 8″ x 11″. [NATHISp7968]

Hydrozoans: Strobalia cupola 1. Cormus 2 Pneumatophora 3-5 Cormidium 6 Tentillum 7 & 8 Gynophora 9 Androphora