File:Conchological Manual Figs 75-81.png

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English: Umbones. These are the prominent points of the dorsal edge, where the growth of the shell commenced, and are called beaks, by some English writers. Fig. 75, distant; 76, straight; 77, curved; 78, spiral; 79, decumbent; 80, free; 81, close.
Date
Source 'A Conchological Manual', available freely at Project Gutenberg
Author George Brettingham Sowerby II, (1812–1884)
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current16:21, 9 August 2013Thumbnail for version as of 16:21, 9 August 20131,461 × 851 (125 KB)Keith Edkins== {{int:filedesc}} == {{Information |Description = {{en|''Umbones.'' These are the prominent points of the dorsal edge, where the growth of the shell commenced, and are called beaks, by some English writers. Fig. 75, ''distant''; 76, ''straight''; 77,...

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