. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. CILIA. 619 which the preceding account is founded, were made more recently. There is no mention of the existence of the phenomenon in the Aphro- dita to be found in systematic works on com- parative anatomy, nor in any of the special memoirs on that animal which I have had an opportunity of consulting. The ciliary motion exists in several other animals belonging to the class Annelida. It is remarkably distinct, and easily observed, on the branchiae or gills of the Serpula. These organs consist of two bunches of pinnated
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. CILIA. 619 which the preceding account is founded, were made more recently. There is no mention of the existence of the phenomenon in the Aphro- dita to be found in systematic works on com- parative anatomy, nor in any of the special memoirs on that animal which I have had an opportunity of consulting. The ciliary motion exists in several other animals belonging to the class Annelida. It is remarkably distinct, and easily observed, on the branchiae or gills of the Serpula. These organs consist of two bunches of pinnated or feather-like processes, which the animal pushes forth from the calcareous tube in which it lives, and spreads out in a radiating form. The edges of the branchiae, both of the stems and of the leaflets, are fringed with cilia, which exhibit their vibrating and undulating motions, and cause a constant current of water over the surface of the gills, serving here, no doubt, as in analogous instances, at least chiefly for respiration. In a paper already referred to,* I mentioned having observed the phenomena in question in the Amphitrite. The animal meant was a com- mon marine tubicolar worm (fig. 300), which Fig. 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 Todd, Robert Bentley, 1809-1860. London, Sherwood, Gilbert, and Piper
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