. The animal creation: a popular introduction to zoology. Zoology. 254 CONCHIFERA. of vitality. A closer and microscopic inspection, however, will soon sliow us currents in tlie water sur- rounding them, streams rejected from their apertures, and water rushing in, indicating that, however torpid the creature roay appear externally, all the machineiy of life, the respiratory wheels and circulatory pumps, are hard at work in its numerous recesses. The. Fig. ig'^coMi'orxD ascidiax. starry eotkyllus* a, natural size; b, one of the composite stars magnified. whole mass, in fact, is composed of a
. The animal creation: a popular introduction to zoology. Zoology. 254 CONCHIFERA. of vitality. A closer and microscopic inspection, however, will soon sliow us currents in tlie water sur- rounding them, streams rejected from their apertures, and water rushing in, indicating that, however torpid the creature roay appear externally, all the machineiy of life, the respiratory wheels and circulatory pumps, are hard at work in its numerous recesses. The. Fig. ig'^coMi'orxD ascidiax. starry eotkyllus* a, natural size; b, one of the composite stars magnified. whole mass, in fact, is composed of an aggregation of minute Ascidians, conjoined in elegant microscopic groups, all constructed upon the same plan as that described above, and all actively employed in takhig in and ejecting the currents that bring them nutriment. CHAPTER XVI. Third Class of Mollusca. The inhabitants of bivalve shells constitute a very numerous and important class. Encased in dense and massive coverings, of such construction as to preclude the possibility of their maintaining more than a very imperfect intercom^se with the external world, and deprived even of the means of communi- cation with each other, we might naturally exjDect their organization to correspond in its general feeble- ness with the circumscribed means of enjoyment, and * fiorpvs, botrys, a himcli of grapes. t Conclia, a shell: fero, I 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 Jones, Thomas Rymer, 1810-1880. London : Society for Promoting Knowledge
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