Elements of zoology, or, Natural Elements of zoology, or, Natural history of animals / ed. by Reese elementsofzoolog00rees Year: 1849 Actinia seen from above. Section of Actina: a, cavity of stomach ; 6, surrounding chambers. of contraction. There is this important difference, however; the stomach does not occupy the whole cavity of the body, but only the central portion; and the space between its wall and the outer integument is divided by vertical membranous parti- tions, passing directly from one to the other, into a number of radiating chambers, in which the germs of young detinue ar
Elements of zoology, or, Natural Elements of zoology, or, Natural history of animals / ed. by Reese elementsofzoolog00rees Year: 1849 Actinia seen from above. Section of Actina: a, cavity of stomach ; 6, surrounding chambers. of contraction. There is this important difference, however; the stomach does not occupy the whole cavity of the body, but only the central portion; and the space between its wall and the outer integument is divided by vertical membranous parti- tions, passing directly from one to the other, into a number of radiating chambers, in which the germs of young detinue are produced, and sometimes nearly matured. The tentacula are hollow, and their cavity is continuous with that of those cham- bers ; at the extremity of each is a small aperture, through which water is occasionally taken in, and then ejected with consider- able force. This process seems to be of the nature of the ac- tion of respiration in higher animals. 903. The tentacula of the sea-anemone can be contracted in the same manner as those of the hydra, and they are furnished with a sort of sucker at their extremities, by which they can draw towards the mouth any substance which comes in con- tact with them. Although each seems weak in itself, the com- bined action of many is sufficiently effectual for maintaining an ample supply of food. These animals are extremely vora- cious. Not being able to move from place to place in search of particular kinds of nutriment, they are adapted to digest almost any which comes within their reach. Shell-fish and small Crustacea appear to be their usual diet. These are 936. What of the ui^rams ? 937. What of the habu«» and structure of these ?
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