Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 717
by the successive additionof new primary plates. To the outer edge of the primary plates,at some little distance from the base, we find attached a set of * See his Memoir On the Structure and Growth of the Tooth of Echinus,in Philos. Transact. for 1861, p. 387. 636 CALCAREOUS SKELETON OF… … Structure of the Tooth, of Echinus:—A, vertical section,showing the form of the apex of the tooth as produced bywear, and retained by the relative hardness of its elementaryparts; o, the clear condensed axis; b, the body formed ofplates ; c, the so-called enamel; rf, the keel:—B, commencinggrowth…
Microscopy · Biology
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