. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. A. Cross section of the Aphrodita B. Alimentary canal and cceca, seen from above. the cells and scales, inclosing them in a space (e) to which the water has free access. Re- turning to the abdomen, we find the nearly straight alimentary canal, its anterior third (f, fig. B) forming the stomach, the remaining part or intestine fg, fig. A and B) being fur- nished on each side with a number of long cceca Ch), whose branched extremities (i, i) are in part lodged in the before-mentioned cells. The abdomen is lined
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. A. Cross section of the Aphrodita B. Alimentary canal and cceca, seen from above. the cells and scales, inclosing them in a space (e) to which the water has free access. Re- turning to the abdomen, we find the nearly straight alimentary canal, its anterior third (f, fig. B) forming the stomach, the remaining part or intestine fg, fig. A and B) being fur- nished on each side with a number of long cceca Ch), whose branched extremities (i, i) are in part lodged in the before-mentioned cells. The abdomen is lined with a de- licate peritoneal membrane, which also lines the cells, and is reflected over the viscera. In the living Aphrodita the water freely enters and issues from the space (e) beneatli the felty membrane, passing over the external surface of the cells and their appendages. The flow of the water in this passage is produced, as I have repeatedly observed, by the elevation and depression of the scales, and on no part of the surface over which the fluid passes is the ciliary motion to be observed. But the water also enters the cavity of the abdomen, though it is doubtful by what orifices this takes place, for my endeavours to find those de- scribed by Treviranus* in the alternate in- tervals of the feet have never been successful. In whatever way it may happen, however, there can be no doubt of the fact that the water enters the abdomen, and consequently fills the dorsal cells and surrounds the intestine and its coeca, which last organs, according to Sir Everard Home and Treviranus, exercise a respiratory function, an opinion which derives additional probability in considering the phe- nomena of the ciliary motion to be here de- scribed. The ciliary motion exists in two situations, 1st, on the external surface of the intestine and coeca and the internal surface of the cells, which surfaces are in contact with the contained water; 2dly, within the intes- tine and coeca, or on t
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