. Bulletins of American paleontology. 4id OlNCINNAflAN CePHALOPODS: FlOWER 33?. Mingonoceros Figure 14. The principal genera of the Valcouroeeratidse and their re- lationsliip. 1-3. Mingamoceras. 1, lateral view; 2, section from venter of siphuncle cutting to different levels in dift'ercnt segments; 3, diagrammatic cross section. Based upon Minijanocrras suhturbinaium (Billings) of the Mingan formation. 4-12. Valcou-roccrofi. 4, lateral view of a typical species; H-?, three successive sections showing the modification of the sec- tion in the phragmocone of a large mature specimen; 8, section s
. Bulletins of American paleontology. 4id OlNCINNAflAN CePHALOPODS: FlOWER 33?. Mingonoceros Figure 14. The principal genera of the Valcouroeeratidse and their re- lationsliip. 1-3. Mingamoceras. 1, lateral view; 2, section from venter of siphuncle cutting to different levels in dift'ercnt segments; 3, diagrammatic cross section. Based upon Minijanocrras suhturbinaium (Billings) of the Mingan formation. 4-12. Valcou-roccrofi. 4, lateral view of a typical species; H-?, three successive sections showing the modification of the sec- tion in the phragmocone of a large mature specimen; 8, section shortly beyond the base of the living chamber of the genotype; 9, cross section near the aperture of genotype; 10, cross section of sipliunele sliowing sym- metry of actinosiphonate lobes; 11, suliorthochoanitic stage of siphuncle, found in early stages (a on fig. 4) ; 12, second stage of siphuncle, found approximately in region b on fig. 4. 13. Mature segments of a typical large species, found in region c as indicated on fig. 4., the only stage with well-developed rays within the siphuncle. 14-18. Augustoceras. 14, lateral and 15, ventral views of the internal mold of a typical form; 16, vertical. 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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