General principles of zoology . ft FIG. 64 -Distoma kefaticum with water-vascular system. /, porus excretonus ; o, mouth- -nenoo tne finest water-vascular canals Lang.) n, nucleus ; /, projection of the terminal cell ;cell ; v, vacuole. of the an end-gut (cloaca), and conduct to the exterior substanceswhich have become useless to the body. The presence GENERAL ORGANOLOGY. 139 of a body-cavity is of importance for their structure,as is most beautifully shown in the group of two kinds of excretory organs occur, the watcr-•rrtscular or protonephridia, and the segmental
General principles of zoology . ft FIG. 64 -Distoma kefaticum with water-vascular system. /, porus excretonus ; o, mouth- -nenoo tne finest water-vascular canals Lang.) n, nucleus ; /, projection of the terminal cell ;cell ; v, vacuole. of the an end-gut (cloaca), and conduct to the exterior substanceswhich have become useless to the body. The presence GENERAL ORGANOLOGY. 139 of a body-cavity is of importance for their structure,as is most beautifully shown in the group of two kinds of excretory organs occur, the watcr-•rrtscular or protonephridia, and the segmental organs orncpJiridia; the former is found in the parenchymatousworms, the latter in the worms which have a water-vessels begin with a closed network of small Xs M
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1896
