. A manual of zoology. Zoology. 116 GENERAL PRINCIPLES OF ZOOLOGY. fig. G71 The canals begin with closed tubes, which are provided internally at the end with a bundle of actively vibrating cilia, the ' flame ' (fig. 08). One or more main trunks lead from the canal system to the exterior. A little before the external ojoening (excretory pore) there is frequently a contractile enlargement, the urinary bladder. With the appearance of a coelom there is a central place for the collection of excreta. The nephridia or segmental organs — usually simple tubes (rarely branched) open at both ends—lead fr
. A manual of zoology. Zoology. 116 GENERAL PRINCIPLES OF ZOOLOGY. fig. G71 The canals begin with closed tubes, which are provided internally at the end with a bundle of actively vibrating cilia, the ' flame ' (fig. 08). One or more main trunks lead from the canal system to the exterior. A little before the external ojoening (excretory pore) there is frequently a contractile enlargement, the urinary bladder. With the appearance of a coelom there is a central place for the collection of excreta. The nephridia or segmental organs — usually simple tubes (rarely branched) open at both ends—lead from this to the exterior. One opening is ex- ternal (fig. GO), the other communicates with the ccelom by means of a ciliated 11. 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
