The Canadian journal of industry, science and art . ost-tertiary deposits of Eastern Canada. These are described in the4th volume of the Canadian Naturalist. The GraptoUtes, already described as a section of the Polypiferaor Corals, (see Vol. VI., p. 503) are referred by some palaeontologiststo the present class. Brachiopoda.—The brachiopods are marine, headless mollusks,provided with a bivalve shell. The valves of this shell are always ofunequal size ; and one is situated on the dorsal, and the other on theventral side of the animal. The ventral valve is almost invariably thelarger of the two
The Canadian journal of industry, science and art . ost-tertiary deposits of Eastern Canada. These are described in the4th volume of the Canadian Naturalist. The GraptoUtes, already described as a section of the Polypiferaor Corals, (see Vol. VI., p. 503) are referred by some palaeontologiststo the present class. Brachiopoda.—The brachiopods are marine, headless mollusks,provided with a bivalve shell. The valves of this shell are always ofunequal size ; and one is situated on the dorsal, and the other on theventral side of the animal. The ventral valve is almost invariably thelarger of the two, and without reference to the anatomy of the mol-lusk would be naturally taken for the dorsal valve. The valves,though unequal in size, are equilateral —i. e., a vertical linedrawn straight through the middle of each valve, divides the shellinto two exactly equal parts. This serves to distinguish at a glancea brachiopod shell from the shells of other bivalves : or at least fromthe great majority of these, as some few, the Peciens for example,. Fi^. S7.
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