Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 759
A, Internal surface (a), and oblique section (6), of Shell ofTerebratida (Waldhermia) austtalis; B, external surface of thesame. canals, as shown in different transverse sections of one and thesame shell, will vary according to the part of its thickness whichthe section happens to traverse.—The…
Microscopy · Biology
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