ClipArt ETC
"Cidaris glandifera, Goldf (spine); Jura, Mount Carmel." — Encyclopedia Britannica, 1893

Fossil Echinidea

"Cidaris glandifera, Goldf (spine); Jura, Mount Carmel." — Encyclopedia Britannica, 1893

"Cidaris florigemma, with spine, a, and single ambulacral plate, magnified, b, (after Wright; Coral Rag." — Encyclopedia Britannica, 1893

Fossil Echinidea

"Cidaris florigemma, with spine, a, and single ambulacral plate, magnified, b, (after Wright; Coral…