Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 714
lso byits contractility to move the spine in any required direction. Thismembrane is probably continued onwards over the whole surface ofthe spine, although it cannot be clearly traced to any distance STRUCTURE OF SPINES OF ECHINIDA. 633 from the base, and the new formations may be presumed to… … Portion of transverse section of Spine of Acrocladia mammillatcu the number of layers shown in a transverse section will depend inpart upon the place of that section. For if it cross near the base,it will traverse every one of the successive layers from the verycommencement; whilst if it cross near…
Microscopy · Biology
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