. Éléments de conchyliologie / préparé pour l'utilisation d'écoles et collèges. Les mollusques. De la classe des céphalopodes. Leçon 19 II. De la classe des Céphalopodes. Général de la Respiration-formulaire-Cir calcul - Organes de la digestion - Cartilage Céphalique - organes de locomotion --Organes des sens - Système nerveux central - Habitudes alimentaires - Division en deux familles. De la famille des Céphalopodes Dibranchiata.- Octopus vulgaris, ou Poulpe-Argonaut-Calmaries-Seiche poissons. De la famille des Céphalopodes Tetrabranchiata. - Nautilus - Ammonites bélemnites-Foraminafera-. D CIiASS CSFKAIiOFODS. 1. Cette classe est composée de mollusques qui sont de forme fantastique,

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. Elements of conchology / Prepared for the use of schools and colleges. Mollusks. CLASS OF CEPHALOPODS. 19 LESSON II. Class of Cephalopoda.—General Form—Respiration—Cir- culation — Organs of Digestion — Cephalic Cartilage — Organs of Locomotion --Organs of the Senses — Nervous System—Habits—Division into two Families. Family of Cephalopoda Dibranchiata.— Octopus vulgaris, or Poulpe—Argonaut—Calmaries—Cuttle-fishes. Family of Cephalopoda Tetrabranchiata. — Nautilus — Ammonites—Belemnites—Foraminafera. CIiASS OF CSFKAIiOFODS. 1. This class is composed of mollusks which are of fantastical shape, for their head is placed between the trunk and feet, or tcntacula, which serve them for locomotion, and when they walk, the body is uppermost, and the head down, dragging on the ground. Their feet are attached, around the mouth, to the head, which circumstance has obtained for them the name of Cephalo- pods (from the Greek, kephale, head, and pous^ foot — pro- nounced hefa-lo-pod).. Fig. 7. OCTOPUS* VULGARIS, OR COMMON FOULFE. 2. The trunk of these animals is covered by the mantle, which is in the form of a sack, sometimes almost spherical, and sometimes more or less elongated; it encloses all the * From the Greek, okto^ eight, and pous^ foot, —eight feet. 1. What kind of animals compose the class of Cephalopods ? Why are they called Cephalopods ? 2, What are the general form and characters of the Cephalopods ?. 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 work.. Ruschenberger, W. S. W. (William Samuel Waithman), 1807-1895; Comté, Achille, 1802-1866; Milne-Edwards, H. (Henri), 1800-1885. Philadelphia : Grigg & Elliot

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