Imágenes de páginas
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elle les recouvre en tout ou en partie: elle eft compofée d'une ou de deux pieces qui font de nature & de forme trèsdifférentes, ou à peu près femblables; ou bien elle confifte en plufieurs pieces.

Quant aux animaux renfermés dans ces coquilles, les uns ont une tête, une bouche, des mâchoires, des dents, des cornes, des des yeux, un col, un manteau, un pied, des trachées, des ouïes, un anus, & un corps: d'autres ont toutes ces parties excepté les yeux, les cornes & le manteau: d'autres enfin n'ont que le manteau, les trachées, les ouïes, la bouche, l'anus & quelquefois le pied.

De là les deux divifions générales des Coquillages en Limaçons & en Conques: de là la fous-divifion des Limaçons en Univalves & en Operculés; & celle des Conques en Bivalves & en Multivalves.

J'ai fait voir dans les deux premieres de ces fubdivifions, que les Porcelaines & les Pucelages tenoient aux Pourpres & aux Rouleaux par la figure de l'animal, ce qui fait la réunion des Coquillages Univalves avec les Operculés. Dans la feconde & la troifiéme on a vû que la Nérite tenoit aux Bivalves par la figure & la liaifon des deux pieces de fa coquille; d'où il eft évident que ces deux familles s'uniffent naturellement, quoique moins intimement que les autres. Enfin, on a vû dans la troifiéme & la quatriéme que la Pholade joignoit étroitement les Multivalves aux Bivalves, autant par la figure du manteau de l'animal, que par les deux ouvertures que fa coquille laiffe aux deux extrémités.

Telle eft la liaifon que j'ai apperçue dans toutes les parties de cet ouvrage, liaison dont la réalité a été affez prouvée par les détails; tel eft auffi l'ordre fuivant lequel j'ai crû devoir traiter les Coquillages que j'ai obfervés au Sénégal, afin d'en rendre la connoiffance d'autant plus facile que j'ai fenti de difficultés en les comparant les uns aux autres, & en les préfentant fous les différentes faces fous lefquelles ils peuvent être confidérés par les perfonnes qui cultivent cette partie de l'histoire Naturelle.

FIN.

TABLE ALPHABETIQUE

Des Matieres contenues dans ce Volume.

Les premiers chiffres indiquent la page, & le dernier les planches.

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Garnot, 40.

2.

18.

14.

2.

Kachin, 187.

Kalan, 137.
Kalifon, 42.

Kaman, 243.
Kambeul, 14.

K.

12.

9.

2.

18. 1.

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