. The book of shells : containing the classes Mollusca, Conchifera, Cirrhipeda, Annulata, and Crustacea. Mollusks; Shells. 08 CLASS CONCHIFKRA. parated animals that otherwise agreed with each other With respect to the bivalve shells, however, this objec- tion does not hold good, as they all contain animals belonging to the class Conchifera. The individuals of this class appear to be deprived of all the senses except that of feeling. Their powers of motion have been so well described by Dr. Roget, in his Bridgewater Treatise, that we cannot do better than extract a portion from that interesting
. The book of shells : containing the classes Mollusca, Conchifera, Cirrhipeda, Annulata, and Crustacea. Mollusks; Shells. 08 CLASS CONCHIFKRA. parated animals that otherwise agreed with each other With respect to the bivalve shells, however, this objec- tion does not hold good, as they all contain animals belonging to the class Conchifera. The individuals of this class appear to be deprived of all the senses except that of feeling. Their powers of motion have been so well described by Dr. Roget, in his Bridgewater Treatise, that we cannot do better than extract a portion from that interesting Yalves of the Unio Batava, vith tlie Connecting Ligament. The tw^o valves of the shell of the Conchifera are united at the back by a hinge-joint, often very artificially constructed, having teeth that lock into each other; and the mechanism of this articulation varies much in dif- ferent species. The hinge is secured by a substance of great strength. During the life of the animal, the usual and natural state of its shell is, that of being kept open for a little distance, so as to allow of the ingress and egress of the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lamarck, Jean Baptiste Pierre Antoine de Monet de, 1744-1829; Dall, William Healey, 1845-1927, former owner. DSI; Society for Promoting Christian Knowledge (Great Britain). Committee of General Literature and Education. London : John W. Parker
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Keywords: ., bookauthordallwilliamheale, bookcentury1800, booksubjectmollusks
