Clam shell varieties set illustration from Mollusca & Shells by Augustus Addison Gould. Original from Biodiversity Heritage… Free Image from public domain license 
Red octopus and an argonaut illustration from Mollusca & Shells by Augustus Addison Gould. Original from Biodiversity… Free Image from public domain license 
Ornate octopus anatomy illustration from Mollusca & Shells by Augustus Addison Gould. Original from Biodiversity Heritage… Free Image from public domain license 
Snail varieties set illustration from Mollusca & Shells by Augustus Addison Gould. Original from Biodiversity Heritage… Free Image from public domain license 
Clam shell varieties set illustration from Mollusca & Shells by Augustus Addison Gould. Original from Biodiversity Heritage… Free Image from public domain license 
Sea snail varieties set illustration from Mollusca & Shells by Augustus Addison Gould. Original from Biodiversity Heritage… Free Image from public domain license 
Octopus mimus, a gould octopus illustration from Mollusca & Shells by Augustus Addison Gould. Original from Biodiversity… Free Image from public domain license 
Sea snail varieties set illustration from Mollusca & Shells by Augustus Addison Gould. Original from Biodiversity Heritage… Free Image from public domain license