Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 868
the tubercle over whichit wrorks, but also by its contractility to move the spine in any requireddirection. The increase in size of the spine appears to be due to theprotoplasmic substance which fills up the spaces in the open networkof the spine and other skeletal structures. Each new… … Fig. (il7.—Portion of transverse section of spine of Heterocentrotus mammillatus. will depend in part upon the place of that section. For if it cross-near the base, it will traverse every one of the successive layers fromthe very commencement ; whilst if it cross near the apex, it willtraverse only…
Microscopy
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