Image d'archive à partir de la page 181 de la cyclopaedia de l'anatomie et. La cyclopaedia de l'anatomie et physiologie cyclopdiaofana01todd Année : 1836 Serpulu 166 genres. annélides, Sabella, Tertbella, Amphitrite, Henrietta, et Siphostoma.) Troisième Ordre.-ANNELIDA TERRICOLA. Corps, totalement démunis de soft appendices. Pieds, à peine ou pas du tout à distinguer, et représentés que par quelques soies. Pas de tête distincte, sans yeux, antennes, ou des mâchoires. Cet ordre comprend les genres Clymena, Lumbricus, Nais, $c. Dans la classification de M. Cuvier, c'est unie à l'Hirudinida pour former l'ordre Anne- li

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Archive image from page 181 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana01todd Year: 1836 166 ANNELIDA. genera Serpulu, Sabella, Tertbella, Amphitrite, Henrietta, and Siphostoma.) Third Order.—ANNELIDA TERRICOLA. Body, completely destitute of soft appendages. Feet, scarcely or not at all distinguishable, and represented only by some bristles. Head not distinct, without eyes, antennae, or jaws. This order comprehends the genera Clymena, Lumbricus, Nais, $c. In the classification of M. Cuvier it is united to the Hirudinida to form the order Anne- lides ubranches. Fourth Order.—ANNELIDA SUCTORIA. Body destitute of bristles for locomotion, com- pletely apodous, and without soft appen- dages. A prehensile cavity in the form of a sucker at each extremity of the body. Head, not distinct, but generally provided with eyes and jaws. This order is composed of the family of Hiru- dinida, and of the genus Brancliellion. External conformation.—The Annelida have always an elongated, generally cylindrical, and vermicular form; sometimes, however, they are flat or more or less oval. The body is com- posed, as we have already observed, of a series of rings, not of a horny or calcareous texture as in the majority of insects and Crustacea, but membranous and separated from each other only by a transverse fold of the integument; as is seen in certain larvae. The number of these rings is occasionally very considerable (some nereida have more than 500), and in many annelida it varies considerably in different individuals of the same species, and seems to increase with age. In some instances these segments are sub- divided into two or more transverse bands by furrows. In general each ring supports a pair of mem- bers, and when an apparently single segment gives origin to a greater number of these or- gans, it is easy to perceive that it results from the union of many rings blended together. The two extremities of the body are sometimes

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