. Elementary text-book of zoology. Zoology. TREMATODA. 319 bryonic development, the contractile, usually ciliated embryos* (fig. 255, «), which already possess the first rudiments of an excretory system and more rarely a sucker with a mouth and alimentary canal, leave the egg and wander about independently in search of a new host. The latter is, as a rule, a snail, into the interior of which they pene- trate and there become transformed into simple or branched Sporocysts (without mouth and alimentary canal, fig. 255, c), or into JRedice (with mouth and alimentary canal, fig. 255, d). These giv

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. Elementary text-book of zoology. Zoology. TREMATODA. 319 bryonic development, the contractile, usually ciliated embryos* (fig. 255, «), which already possess the first rudiments of an excretory system and more rarely a sucker with a mouth and alimentary canal, leave the egg and wander about independently in search of a new host. The latter is, as a rule, a snail, into the interior of which they pene- trate and there become transformed into simple or branched Sporocysts (without mouth and alimentary canal, fig. 255, c), or into JRedice (with mouth and alimentary canal, fig. 255, d). These give rise, by means of the so-called germs [cells lying in the body cavity of the D. 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 Claus, Carl, 1835-1899; Sedgwick, Adam, 1854-1913; Sinclair, F. G. (Frederick Granville), b. 1858. New York : Macmillan

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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1884