. Texte élémentaire-livre de zoologie. 276 A. MOLLUSQUES III.-sépia. Embranchement des Mollusques (p. 282). Classe des céphalopodes (p. 284), Sépia officinalis est un gros mollusque, souvent près d'un pied de longueur. C'est trouvé communément autour de nos côtes, bien que plus abondante dans le sud. Il vit une vie pélagique, l'itinérance, et est un mangeur de chair vorace. Sa coquille séchée est souvent jeté sur le rivage. L'animal est constitué d'une tête et son corps. Le corps est aplati et en forme de bouclier, avec une expansion latérale ou fin le long de chaque Fig. 194.-Vue dorsale edge. La tête a dix tentacules, de la politique commune de seiches qui les fo

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. Elementary text-book of zoology. 276 MOLLUSC A. III.—SEPIA. Phylum MOLLUSCA (p. 282). Class Cephalopoda (p. 284), Sepia officinalis is a large mollusc, often nearly a foot in length. It is found commonly round our coasts, though more abundant in the south. It lives a free, roaming, pelagic life, and is a voracious flesh-eater. Its dried shell is often found cast up on the shore. The animal consists of a head and body. The body is flattened and shield-shaped, with a lateral expansion or fin along each Fig. 194.—Dorsal View edge. The head has ten tentacles, OF THE Common Cuttle of which the fourth pair are as long (Sepia ogidnalts)x.l. as the body and bear a pad of suckers at the end. The other eight have fotir rows of small suckers on their inner surface. A dead "cuttle" appears of a dull white colour with patches of drab, but in life there is a beautiful play of colour and light over the whole surface of the body. This is caused by a number of chromato- phores or pigment cells which are actively contractile, and hence can alter their extent. The result is an ever-changing colour and irid- escence. In a general way, the upper surface of the body is of a dark brown hue. It is horizontally striped with irregular bands of white and the fins are similarly dotted with white. The dorsal surface of the head is also brown. The tentacles and the whole under- surface are pearly white. Sepia is piano-symmetric to a marked degree, and there is no trace of torsion as in the snail. The mouth is situated between the tentacles and is armed by a pair of powerful horny jaws or beaks, not unlike those of some parrots in size and appearance. The head is connected to the body by a constricted neck, around which hangs the front edge of the mantle.. 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.. Masterm

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