Geology; for Teachers

Cover Geology; for Teachers
Geology; for Teachers
Tenney, Sanborn, 1827-1877. [from Old Catalog]
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Fig. 73.
Sarsift.
Pleurobrachia.
In one of his papers, Agassiz has remarked as fol- io Digitized by CjOOQ IC 110 THE ANIMAL KINGDOM.
lows, about these curious animals of the sea: — "It is in reality one of the most wonderful sights which the philosophic naturalist can behold, to see animals scarcely more dense than the water in which they play, and almost as limpid, perform, in that medium, movements as varied as those of the eagle which soars in the air, or the butterfly dancing from flower to
... flower, testifying, by their activity, their sensitive- ness and their volition." The Jelly-fishes here alluded to are small. Some other species grow to a great size, weighing, some- times, 30 or 40 pounds ; and these, too, are born of hydroids of different kinds. One of the most com- mon species is the umbrella- shaped one, seen every- where along our coast, popularly known as the Sun- fish.
Ctenophorse are better represented by Fig. 73, than by any description that I can give.
EcHiNODERMS comprise marine animals which mostly have a calcareous covering bearing spines, though one order is made up of animals which have a thick tough skhi.


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