Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 637
Fig. 323. … General view of the internal structure of Parkeria:—In thehorizontal section, Z1, Z2, Z3, Z4, mark the four thick layers ; in thevertical sections, A marks the internal surface of a layerseparated by concentric fracture ; B, the appearance presentedby a similar fracture passing through the…
Microscopy · Biology
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