. Bulletins of American paleontology. Mexican ammonites: Verma &: Westermann 171 30 20 10 u (mm). (*') tP Author's Coll. ? Q D ? O^ Other Coll • P. zitteli (Burckhardt) Syntypes o P zitteli - Krantz ? P cf zitfeli — Imlay ^ P subrasile 8t P off subrasile (Burckhardtj 10 50 100 150 D(mm) Text-fig. 13. — Scatter diagram of umbilical width (U) -vs. diameter (D) for Pscudotissoceras zitteli (Burckhardt), macroconchs [9] + probable microconch [? $'\ from North America and South America. Inner whorls of only two better preserved macroconchs are plotted (approximate data in parenthesis and with d
. Bulletins of American paleontology. Mexican ammonites: Verma &: Westermann 171 30 20 10 u (mm). (*') tP Author's Coll. ? Q D ? O^ Other Coll • P. zitteli (Burckhardt) Syntypes o P zitteli - Krantz ? P cf zitfeli — Imlay ^ P subrasile 8t P off subrasile (Burckhardtj 10 50 100 150 D(mm) Text-fig. 13. — Scatter diagram of umbilical width (U) -vs. diameter (D) for Pscudotissoceras zitteli (Burckhardt), macroconchs [9] + probable microconch [? $'\ from North America and South America. Inner whorls of only two better preserved macroconchs are plotted (approximate data in parenthesis and with dashed line). P. subrasile (Burckhardt) and P. aii. subrasile fall within the range of variation of P. 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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