. Bulletins of American paleontology. . Text-fig. 22. — Ribbing of Kossmatia purisima, n. sp. Plot of primary ribs bifurcation height (Bh) as percentage of whorl height (H) vs. diameter (D), for McM - J 1501/2, left and right sides (aperture facing downwards facing observer). Most ribs (assumed to be equidistant) bifurcate in a zone between 45-65%. Lows on the left side roughly correspond to the highs on the right side. Bh is subject to some error because of the difficulty in deter- mining the exact point of bifurcation. much more compressed whorl section (H/W vs. < ). K. vict
. Bulletins of American paleontology. . Text-fig. 22. — Ribbing of Kossmatia purisima, n. sp. Plot of primary ribs bifurcation height (Bh) as percentage of whorl height (H) vs. diameter (D), for McM - J 1501/2, left and right sides (aperture facing downwards facing observer). Most ribs (assumed to be equidistant) bifurcate in a zone between 45-65%. Lows on the left side roughly correspond to the highs on the right side. Bh is subject to some error because of the difficulty in deter- mining the exact point of bifurcation. much more compressed whorl section (H/W vs. < ). K. victoris Burckhardt is close to the upper range of our species in whorl compression, but does not possess a subtrapezoidal section and is more evolute (U/D vs. ) (Text-fig. 24). The whorl section of K. zacatecana Burckhardt (H/W = ) falls with- in the lower range of variation of our species (Text-fig. 21) but it is more evolute (U/D = ) (Text-fig. 24). K. interrupta Burck- hardt is much more compressed (H/W = at 76 mm D) and much more evolute (U/D = ). The microconchs of K. bijurcata, K. tnexicana and K. densicostata fall within the upper range of variation oi K. purisima (Text-figs. 21, 24) but they are distinguish- ed by the density and style of ribbing. The smaller specimen of "Hoplites calisto var.^'' of Aguilera (pi. XXII, fig. 2) from Sierra Catorce was renamed by Burckhardt. 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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