History of British Mollusca, Vol. 2 Edward Forbes

Excerpt from History of British Mollusca, Vol. 2: And Their Shells

The Cockles, properly so called, form a very natural assemblage, presenting well-marked characters both of shell and animal. Their shells are of variable thickness, sometimes Это и многое другое вы найдете в книге History of British Mollusca, Vol. 2 (Edward Forbes)