File:Conchological Manual Fig 12.png

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English: Fig. 12. Dentalium Elephantinum. "This has an opening at the anterior termination a, called the aperture. The opening at the posterior end (p) is named a fissure, or perforation. The ribs running along the sides of the shell are longitudinal, or radiating. And the lines round the circumference are lines of growth, or concentric—each one having in succession, at earlier stages of growth, formed the aperture. They are described as concentric, or transverse."
Date
Source 'A Conchological Manual', available freely at Project Gutenberg
Author George Brettingham Sowerby II, (1812–1884)
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current10:16, 9 August 2013Thumbnail for version as of 10:16, 9 August 20131,441 × 319 (51 KB)Keith Edkins== {{int:filedesc}} == {{Information |Description = {{en|Fig. 12. ''Dentalium Elephantinum.'' "This has an opening at the anterior termination ''a'', called the aperture. The opening at the posterior end (''p'') is named a fissure, or perforation. The...

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