. Bulletins of American paleontology. 46 Bulletin 116 128 in Troedsonella Kobayashi. III. Annulosiplionate deposits (figs. 6 D, 7). These con- sist of doughimtlike rings formed at the septal foramina. In ex- treme cases the rings may l)ecome so enlarged as to occupy most. Figure 7. Idealii'>ed section of a Trcptuceras showing tlie spatinl rela- tionships of the variouij canieral (?G. 'J'l/c sipiiunclo is wide init- ially liaving tlic type of segment characteristic of Armcnoccras. Farther orad the splierical segments of Ormoceras occur, and adorally the segments of Beiroceras, whic
. Bulletins of American paleontology. 46 Bulletin 116 128 in Troedsonella Kobayashi. III. Annulosiplionate deposits (figs. 6 D, 7). These con- sist of doughimtlike rings formed at the septal foramina. In ex- treme cases the rings may l)ecome so enlarged as to occupy most. Figure 7. Idealii'>ed section of a Trcptuceras showing tlie spatinl rela- tionships of the variouij canieral (?G. 'J'l/c sipiiunclo is wide init- ially liaving tlic type of segment characteristic of Armcnoccras. Farther orad the splierical segments of Ormoceras occur, and adorally the segments of Beiroceras, which are longer ti;an wide, appcir. Annulosiphonale de- posits appear as simple annuli, shown in the adoral segments, and grow into pendant deposits which fill the siphuncle in the apical portion except for the sijihonal vascular system. Tlie apical two segments show the sec- ondary perispatial deposit in t'le pevisijalium. Carneral deposits are mural and show an ontogenetic prog'-cssion from the adoral to ti'.e adapical part of the tigure. This is slightly idealized in that such changes in the form of the siphuncle and the cameral and siphonal deposits would ordinarily occupy a longer series of 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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