The Medals of Creation, Volumes 1 and 2 First Lessons in Geology and the Study of Organic Remains
Chapter IX.--Fossil Echinidæ, 311. Cidaritidæ, 314. Cidaris, 316.
Diadema, 318. Echinus, 318. Salenia, 318. Spines of Cidarites, 319. Flint Casts of Cidarites, 320. Cidaritidæ of the Palæozoic Rocks, 321. Clypeasteridæ, 322. Galerites, 322. Holectypus, 324. Discoidea, 324. Clypeideæ, 325. Clypeus, 325. Nucleolites, 326. Spatangidæ, 326. Ananchytes, 327. Micraster, 328. Toxaster, 329. Holaster, 330. Geological Distribution of Echinites, 330. On Collecting and Developing Echinodermata, 331.