. Bulletins of American paleontology. . Text-fig. 28. Composite cross-section of Eiidmrtoccras {Ettaptctocrras) atnplectens (Buck.) ; well-preserved phragmocone from loc. A22 in the Eiuimrto- ccras zonule (PI. 68, fig. 1), body chamber from loc. A447 in the E. hoivclli zonule of Wide Bay (PI. 67, fig. 2) ; X early whorls are evolute and rather ihin. At 13 mm. the whorl sec- tion is somewhat compressed suboval and no costation is yet dis- cernible, though some fine ornament may be j^resent and obscured by the poor preservation. The other specimen, from A 22, shows well the whorl section of
. Bulletins of American paleontology. . Text-fig. 28. Composite cross-section of Eiidmrtoccras {Ettaptctocrras) atnplectens (Buck.) ; well-preserved phragmocone from loc. A22 in the Eiuimrto- ccras zonule (PI. 68, fig. 1), body chamber from loc. A447 in the E. hoivclli zonule of Wide Bay (PI. 67, fig. 2) ; X early whorls are evolute and rather ihin. At 13 mm. the whorl sec- tion is somewhat compressed suboval and no costation is yet dis- cernible, though some fine ornament may be j^resent and obscured by the poor preservation. The other specimen, from A 22, shows well the whorl section of the phragmocone beyond 16 mm. di- ameter. The sides become flattened and con\'erge only slightly ex- cept for the outer one-third which sloj^es to the rounded extern- side; the umbilical slojie lemains rather gentle and grades well roimded into the sides. As the height increases rapidly the whorls become more and more involute and compressed. The keel is high, well separated, and hollow-floored. Near the end of the phragmo- cone, at approximately (SO mm. diametei', the umbilical width is 10-12%. At slightly over 20 nun. diameter there are densely spaced fine rectiradiale and onl\ slightly projected, aj)j)arently regular. 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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Keywords: ., bookauthorpaleonto, bookcentury1800, bookdecade1890, bookyear1895
