. Bulletins of American paleontology. B. Fig. 2. Siphuncles of Tasmanian species of the Pseudorthoceratidae. A. Mys- trrioccras australe, n. gen., n. sp., Middle Ordovician. Parietal deposits originate at the septal neck and grow adapically. B. Stromatoce-ras eximium, n. gen., n. Middle Silurian. Siphuncular deposits consist of two distinct components; the outer is discontinuous, growing from the septal neck both adorally and adapically, the inner is continuous but is probably the product of the fusion of discrete pendant deposits. C. Gordonoceras bondi, n. gen., n. sp., Middle Silurian.
. Bulletins of American paleontology. B. Fig. 2. Siphuncles of Tasmanian species of the Pseudorthoceratidae. A. Mys- trrioccras australe, n. gen., n. sp., Middle Ordovician. Parietal deposits originate at the septal neck and grow adapically. B. Stromatoce-ras eximium, n. gen., n. Middle Silurian. Siphuncular deposits consist of two distinct components; the outer is discontinuous, growing from the septal neck both adorally and adapically, the inner is continuous but is probably the product of the fusion of discrete pendant deposits. C. Gordonoceras bondi, n. gen., n. sp., Middle Silurian. Parietal deposits grow adorally from the septal neck. D. Ephippinrtlioceras decorum, n. sp., Middle Silurian. Parietal deposits grow adorally from the septal 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 Paleontological Research Institution (Ithaca, N. Y. ); Columbia University. Ithaca, N. Y. , Paleontological Research Institution [etc. ]
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