. The animal creation: a popular introduction to zoology. Zoology. EOTIFEEA. ,(?'™"' •:>j>^; %. paddle-wheels, carry it rapidly along witli an equable gliding movement. Some of these little creatures are enclosed in a trans- parent shell, often variously armed with spines at one or both extremities, but others are not so enclosed. The eggs of the Rotifera form beautiful objects for microscopic study. They are covered with a transparent shell, through which the parts of the embryo, as they develop themselves, gi-adually be- come distinctly apparent, until at length the cilia are seen
. The animal creation: a popular introduction to zoology. Zoology. EOTIFEEA. ,(?'™"' •:>j>^; %. paddle-wheels, carry it rapidly along witli an equable gliding movement. Some of these little creatures are enclosed in a trans- parent shell, often variously armed with spines at one or both extremities, but others are not so enclosed. The eggs of the Rotifera form beautiful objects for microscopic study. They are covered with a transparent shell, through which the parts of the embryo, as they develop themselves, gi-adually be- come distinctly apparent, until at length the cilia are seen performing their mimic rotation, though as yet the imprisoning shell has not been broken. At last, by the action of these organs, which every moment becomes more energetic, the transparent membrane is ruptured, and the little creature bursts forth, eager to enter upon its new existence, ^J? and already possessing ^the form of its parent. The time from the ex- clusion of the egg to the hatching is commonly about twelve houi*s. Ehrenberg watched an in- dividual through eighteen successive days; it was full grown when he first observed it, and it did not die of old age at last. Such an individual he found to be capable of producing four eggs every twenty-four hours, the progeny derived from which grow to maturity and exclude their fertile ova in the same period, a sino-le Eotifer thus pro- eggs, developed with*the rapidity thus stated ; this. ^^^. 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 Jones, Thomas Rymer, 1810-1880. London : Society for Promoting Knowledge
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Keywords: ., bookauthorjo, bookcentury1800, bookdecade1860, booksubjectzoology
