 Gasteropoda. plan of construction that seems common to by far the greater number of them ; and any considerable departures from this are uncommon. The small proportion of animal matter contained in most of these shells is a very marked feature in their...  The Microscope and its revelations - Pagina 567door William Benjamin Carpenter - 1856 - 778 pagina’sVolledige weergave - Over dit boek
 | British Association for the Advancement of Science - 1848 - 784 pagina’s
...common to by far the greater number of them ; and any considerable departures from this are uncommon. The small proportion of animal matter contained in...explanation of the appearances shown by sections, &c. In fact, as Mr. Hatchett observed long since, the porcellanous shells do not yield any distinct... | |
 | British Association for the Advancement of Science - 1848 - 680 pagina’s
...common to by far the greater number of them; and any considerable departures from this are uncommon. The small proportion of animal matter contained in...character, and it serves to render other features in- • distinct; since the residuum left after the removal of the calcareous matter is usually so... | |
 | John Gwyn Jeffreys - 1865 - 422 pagina’s
...common to by far the greater number of them ; and any considerable departures from it are uncommon. The small proportion of animal matter contained in...and it serves to render other features indistinct." A univalve shell consists of three layers of cellular plates, each of the upper two layers lying unconformably... | |
 | British Association for the Advancement of Science. Meeting - 1848 - 754 pagina’s
...common to by far the greater number of them; and any considerable departures from this are uncommon. The small proportion of animal matter contained in...explanation of the appearances shown by sections, &c. In fact, as Mr. Hatchett observed long since, the porcellanous shells do not yield any distinct... | |
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