A Pictorial Atlas of Fossil Remains, consisting of coloured illustrations selected from Parkinson's "Organic remains of a former world," and Artis's "Antediluvian phytology."

by Gideon Algernon Mantell

Plate LIV.

PLATE LIV.

Various Species of Fossil Sea-Urchins.

Fig. 1. A large, discoidal echinite, of the type called Clypeus or Shield-echinus, (Clypeus sinuatus, of Leske,) from the Coral Rag of Oxfordshire. This species abounds in the beds of this division of the Oolite in Berkshire, Wiltshire, Gloustershire, &c.

Fig. 2. "Echinanthites orbicularis (Pygurus) of Leske."—Mr. Parkinson.

Fig. 3. An imperfect flint cast of an echinus (Discoidea), from the South Downs.

Fig. 4. The Helmet Echinite, (Ananchytes ovatus, of Lamarck,) from the Chalk of Kent. This is a characteristic species of the white chalk, and abounds in the strata of the North and South Downs. At Northfleet, near Gravesend, the quarry-men find beautiful specimens.