Carpenter, William Benjamin, 1813-1885 · London : John Churchill · leaf 622
perpendicularly from one surface tothe other (as is shown in vertical sections, Pig. 261), and ter-minating internally by open orifices (Fig. 259), whilst exter-nally thej^ are covered by the periostracum (Fig. 260). Theirdiameter is greatest towards the external surface, where theysometimes expand… … Fi&. 260. i Fig. 259. Internal surface (a), and oblique section (5), of Shell ofTerebratitla (Waldheimia) australis.Fig. 260. External surface of the same, the preceding (Fig. 261, A.,dd). Hence the diameter of thesecanals, as shown m differeiit transverse sections of one andthe same shell,…
Microscopy
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