Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 871
ery respect, save that thenetwork is more open; but that of the teeth differs from it so widelyas to have been likened to that of the bone and dentine of vertebrateanimals. The careful investigations of Mr. James Salter,1 however,have fully demonstrated that the appearances which have suggestedthis… … Pig. 020.—Structure of the tooth of Echinus: A, vertical section, showingthe form of the apex of the tooth as produced by wear, and retained bythe relative hardness of its elementary parts; a, the clear condensed axis;b, the body formed of plates; c, the so-called enamel; a, the keel. B,commencing…
Microscopy
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