. Biology. Biology. MUSCLES OF THE EARTHWORM 147 on the ventral wall of the somite (Figs. 55 and 58). All of the turns are richly supplied with blood vessels. If carmine powder is injected into the coelom, it is taken up by the chlorogogue cells, which then break down, freeing the carmine together with fragments of the chlorogogue cells, and all are caught up by the current made by the nephrostome, and carried through the nephridium to the outside. From this experiment the conclusion has been drawn that some, at least, of. FIG. 58.—Xephridium of Lumbricus. /, Funnel or nephrostome; ds, dissepi
. Biology. Biology. MUSCLES OF THE EARTHWORM 147 on the ventral wall of the somite (Figs. 55 and 58). All of the turns are richly supplied with blood vessels. If carmine powder is injected into the coelom, it is taken up by the chlorogogue cells, which then break down, freeing the carmine together with fragments of the chlorogogue cells, and all are caught up by the current made by the nephrostome, and carried through the nephridium to the outside. From this experiment the conclusion has been drawn that some, at least, of. FIG. 58.—Xephridium of Lumbricus. /, Funnel or nephrostome; ds, dissepi- ment; , narrow tube, ciliated between a and b, d and e and at c; , middle tube ciliated between // and /; ,- wide tube; ;., muscular part; ex, external opening. (From Sedgwick and Wilson, after Benham.) the waste matters of the tissues are brought in the circulation to the chlorogogue cells, and are acted upon by the fluids of these cells. The products of this activity are liberated into the coe- lom by the fragmentation of the cells, and then are excreted from the worm by the nephridia. Dorsal Pores.—Excretion is also carried on to a limited extent through dorsal pores situated in the annuli in the mid-dorsal line. G. THE MUSCULAR SYSTEM.—The main muscular and sup- porting system of the earthworm is relatively simple, consisting of two walls of muscle fibers which form a continuous sheath from anterior to posterior ends of the worm. Being united with the skin to form the body wall, it is known as dermal musculature. The. 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 Calkins, Gary N. (Gary Nathan), b. 1869. New York, H. Holt and company
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