Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 913
one is worn away—somewhat as thefront teeth of the rodents are constantly being regenerated from thesurface of the pulps which occupy their hollow conical bases—as fastas they are rubbed down at their edges, or as a nail is constantlybeing worn away at its free end, and fashioned anew in itsbed.… … Fig. G50.— Palate o: Lcris tuberculata. 1 Ann. Nat. Hist. ser. ii. vol. x. 1852, p. 413. DEVELOPMENT OF MOLLUSCA 857 membrane that forms the sheath of the tube, when this is thickenough to interfere with its transparence. The tube itself should beslit up with a pair of hne scissors through its…
Microscopy
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