Our purpura fisheries are nearly gone, and even pearls are becoming exhorbitant; we have scarcely unguents enough for the service of the gods!
"Salammbo"
Gustave Flaubert
purpura tetragona, Red Crag.
"The Student's Elements of Geology"
Sir Charles Lyell
1853. 18-21. Yolk-segmentation in purpura.
"On the Origin and Metamorphoses of Insects"
Sir John Lubbock