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

Fig. 32. This appears to be an imperfect specimen of a bivalve having a fibrous structure, like Pinna. It is probably a fragment of an Inoceramus.

Plate LXIII.

PLATE LXIII.

Trigoniæ.

Figs. 1, & 2, represent the structure of the hinge in both valves of a genus of bivalves of which numerous fossil species are met with in the secondary strata, and two or three species still exist in the Pacific Ocean. The genus is named Trigonia, from the form of the hinge, and the specific names below are those given by Mr. Parkinson.

Fig. 3. Trigonia clavellata, of Parkinson, from the Kimmeridge clay, Hartwell, Bucks.

Fig. 4. Trigonia costata, Oxford clay, Wilts.