. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Carboniferous Devonian Silurian Ordovician Cambrian CEPHALOPODS 12 3 4 5 6 X 25 ?. EzzaCalcite mm Araqonite 77m Calcite S Aragonite Fig. 3. A schematic presentation of some inferred phylogenetic changes in crystal polymorph compositions. (Fossil data from Ikrggild.) Coelenter- ates: 1. Hydrocorallina, 2. Stromotoporoidea, 3-4. Alcyonaria, 5. Tabulata, 6. Eugosa, 7-8. Scleractinia. Cephalopods: 1-2. Nautiloidea, 1. shell, 2. beak tippings; 3-4. Ammonoidea, 3. shell, 4. aptichi; 5. Belemnoidea; 6. Sepi- oidea; 7. Octopo
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Carboniferous Devonian Silurian Ordovician Cambrian CEPHALOPODS 12 3 4 5 6 X 25 ?. EzzaCalcite mm Araqonite 77m Calcite S Aragonite Fig. 3. A schematic presentation of some inferred phylogenetic changes in crystal polymorph compositions. (Fossil data from Ikrggild.) Coelenter- ates: 1. Hydrocorallina, 2. Stromotoporoidea, 3-4. Alcyonaria, 5. Tabulata, 6. Eugosa, 7-8. Scleractinia. Cephalopods: 1-2. Nautiloidea, 1. shell, 2. beak tippings; 3-4. Ammonoidea, 3. shell, 4. aptichi; 5. Belemnoidea; 6. Sepi- oidea; 7. Octopoda. for the present day Mytilidae could be evaluated to the effect that the aragonitic shell can be related to environmental control and not to an evolutionary change. Groups which comprise species with single crystal polymorph composition which are today either environment independent. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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Keywords: ., bookauthorharvarduniversity, bookcentury1900, booksubjectzoology
