First lesson in zoology : adapted for use in schools . FiQ. &1.—Echmarachnius, common Sand-cake. (Natural size.) to fifty or more fathoms. It eats sea-weeds, and is also ascavenger, feeding on dead fish, etc. The shell consists of five double rows of limestone piecescalled anibulacral plates, which are perforated for the exitof the suckers or feet, which are like those of are also fiv^ double rows of inUramiulacral plates, 50 FIB8T LESSONS IN ZOOLOGY. to which the spines are attached. The sand-cake urchin(Pig. 51) is very flat, with minute spines. On placing an Echinus in sea-w
First lesson in zoology : adapted for use in schools . FiQ. &1.—Echmarachnius, common Sand-cake. (Natural size.) to fifty or more fathoms. It eats sea-weeds, and is also ascavenger, feeding on dead fish, etc. The shell consists of five double rows of limestone piecescalled anibulacral plates, which are perforated for the exitof the suckers or feet, which are like those of are also fiv^ double rows of inUramiulacral plates, 50 FIB8T LESSONS IN ZOOLOGY. to which the spines are attached. The sand-cake urchin(Pig. 51) is very flat, with minute spines. On placing an Echinus in sea-water the movements ofthe animal, especially its mode of drawing itself along by. — iiminitniiiiiiiiiiiiiiiiiiiiiiiiiiiiiiw iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiMiiiiiiiiii—nM Fig. 53.—Echinus on its back. its numerous long suckers, and how it covers itself bydrawing together bits of sea-weed and gravel, may be observed. Of course the sea-urchin is a heavier, clumsier creaturethan the starfish, and when turned over on its back feeble
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1894
