"Palaechinus sphaericus, Scouler; Carbouiferous, Ireland." — Encyclopedia Britannica, 1893

Fossil Echinidea

"Palaechinus sphaericus, Scouler; Carbouiferous, Ireland." — Encyclopedia Britannica, 1893

"Archaeocidaris Urii, Flem (spine and intermediate plate); Carboniferous, Ireland." — Encyclopedia Britannica, 1893

Fossil Echinidea

"Archaeocidaris Urii, Flem (spine and intermediate plate); Carboniferous, Ireland." — Encyclopedia…

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

Fossil Echinidea

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

"Hemicidaris intermedia, Flem.; Corallian, Calne." — Encyclopedia Britannica, 1893

Fossil Echinidea

"Hemicidaris intermedia, Flem.; Corallian, Calne." — Encyclopedia Britannica, 1893

"Salenia petalifers, Desm., U Greensand, Wilts." — Encyclopedia Britannica, 1893

Fossil Echinidea

"Salenia petalifers, Desm., U Greensand, Wilts." — Encyclopedia Britannica, 1893

"Dysaster ringens, Ag., Inferior Oolite, Dorset." — Encyclopedia Britannica, 1893

Fossil Echinidea

"Dysaster ringens, Ag., Inferior Oolite, Dorset." — Encyclopedia Britannica, 1893

"Hemipneustes Greenovii, Forbes, U. Greensand, Blackdown" — Encyclopedia Britannica, 1893

Fossil Echinidea

"Hemipneustes Greenovii, Forbes, U. Greensand, Blackdown" — Encyclopedia Britannica, 1893

"Catopygus carinatus Goldf., U. Greensand, Wilts." — Encyclopedia Britannica, 1893

Fossil Echinidea

"Catopygus carinatus Goldf., U. Greensand, Wilts." — 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…

"Ananchytes ovatus, Lam.; U. Chalk, Europe." — Encyclopedia Britannica, 1893

Fossil Echinidea

"Ananchytes ovatus, Lam.; U. Chalk, Europe." — Encyclopedia Britannica, 1893

"Pygaster semisulcatus, Ph.; Inf. Oolite, Cheltenham." — Encyclopedia Britannica, 1893

Fossil Echinidea

"Pygaster semisulcatus, Ph.; Inf. Oolite, Cheltenham." — Encyclopedia Britannica, 1893

"Galerites albogalerus, Lam.; U. Chalk, Kent." — Encyclopedia Britannica, 1893

Fossil Echinidea

"Galerites albogalerus, Lam.; U. Chalk, Kent." — Encyclopedia Britannica, 1893

"Scutella subrotunda; Miocene, Malta." — Encyclopedia Britannica, 1893

Fossil Echinidea

"Scutella subrotunda; Miocene, Malta." — Encyclopedia Britannica, 1893