. Animal physiology. Physiology, Comparative; Physiology, Comparative. Fig. 63.—Ammonite. to us iii a fossil state, constitute the nautilites, ammonites, belemnites, &c, which abound in many rocks. The Cuttle-fish are animals of considerable activity; their mouth is furnished with a horny beak, strongly resembling that of the parrot; and their arms are provided with a series of very curiously constructed suckers, by the action of which they can take a very firm hold of anything which they desire to grasp. 122. The class of Pteropoda, or wing-footed Molluscs, con- sists of but few species,
. Animal physiology. Physiology, Comparative; Physiology, Comparative. Fig. 63.—Ammonite. to us iii a fossil state, constitute the nautilites, ammonites, belemnites, &c, which abound in many rocks. The Cuttle-fish are animals of considerable activity; their mouth is furnished with a horny beak, strongly resembling that of the parrot; and their arms are provided with a series of very curiously constructed suckers, by the action of which they can take a very firm hold of anything which they desire to grasp. 122. The class of Pteropoda, or wing-footed Molluscs, con- sists of but few species, and the animals which it contains are all of them of small size ; but the individuals are often very nume- rous, whole fleets of them being sometimes seen covering the ocean, especially in the Arctic and Antarctic regions, where they constitute one of the principal articles of food to the Whale. The general form of the body usually differs but little from that repre- sented in Fig. 64. On either side, a little behind the head, the mantle is extended into a fin-like expansion; by the aid of which, the animal can swim rapidly through the water. The hinder part of the body is usually enclosed, more or less completely, in a shell, which is commonly of extreme thinness and deli- cacy. The head is not furnished with long arms, to grasp the food ; but it has a number of minute sucking discs, by which it can lay firm hold of whatever it attacks; whilst its powerful rasp-like tongue is set to work upon it. 123. The class Gasteropoda, which is the next in order, contains those animals which, like the snail and slug, crawl upon a fleshy disc on the under side of their bodies. The greater part of them are inhabitants of the sea-shore, rivers, lakes, &c.; some have the power of swimming freely through the open sea; and the proportion of those that breathe air and live on land, is com-. Please note that these images are extracted from scanned page images that may have been di
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