Caption:
Prickly cockle, Acanthocardia echinata (Cardium echinatum) 1, and slender sea pen, Virgularia mirabilis (Pennatula mirabilis) 2. Closed clam A, with foot extended B, fully open showing anatomy C. Handcoloured copperplate engraving from Bertuch's "Bilderbuch fur Kinder" (Picture Book for Children), Weimar, 1807. Friedrich Johann Bertuch (1747-1822) was a German publisher and man of arts most famous for his 12-volume encyclopedia for children illustrated with 1,200 engraved plates on natural history, science, costume, mythology, etc., published from 1790-1830.