. A manual of zoology. Zoology. Fig. 67, Fig. 68. Fig. &7.—DMiiimtm liepaticum with water-vascular system. (From p, porus excretorius; a, mouth. Fig. —Blind end of one of the finest water-vascular canals (/.) of a Turhellarian. (From Lang.) '(, micleus; /, processes of the terminal cell; ir!\ 'flame' of the terminal cell; i', vacuole. funnel, the nepJirostome, a wide mouth with active cilia which connects with the canal of tlie tube. Through this the ex- cretion (in annelids peritoneal (/ells laden with guanin—the dis- integrated ' chloragogue' cells) is carried to the outsi
. A manual of zoology. Zoology. Fig. 67, Fig. 68. Fig. &7.—DMiiimtm liepaticum with water-vascular system. (From p, porus excretorius; a, mouth. Fig. —Blind end of one of the finest water-vascular canals (/.) of a Turhellarian. (From Lang.) '(, micleus; /, processes of the terminal cell; ir!\ 'flame' of the terminal cell; i', vacuole. funnel, the nepJirostome, a wide mouth with active cilia which connects with the canal of tlie tube. Through this the ex- cretion (in annelids peritoneal (/ells laden with guanin—the dis- integrated ' chloragogue' cells) is carried to the outside. The excretory organs (kidneys) of vertebrates are derived from such uephridia. The fact that in the embryos (and frequently in the adults) these open into the coelom by nei)hrostomes makes it proljtible that also in the verteln'ates the custom was oiu^e important in excretion (fig. 7<l). The increasing importance of the blood- vessels which envelop the ne})hridial canals and bring to them the waste matter taken from the tissues is }n'ol)ably tlu^ cause of the loss of connexion of the kidnevs with tlio ('(elmn bv degenera-. 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 Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1902
