. Bulletins of American paleontology. Glossaulax vesicalis Glossaulax reiniana. Glossaulax bicolor Text-figure 20. —Basal views of (1-3) Glossaulax didyma didyma (Roding, 1 798). (4) G. vesicalis (Philippi, 1848), (5) G. reiniana (Dunker. 1877). and (6) G. bicolor (Philippi. 1848). Umbilical characters of G. didyma didyma: a shallowly but widely incised spiral groove (arrow a) on the umbilical wall and a shallowly incised transverse callus groove crossing to the inner margin of the aperture at an acute (angle A) to a right angle (angle B). Glossaulax vesicalis: a weakly angular base (arrow d)

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. Bulletins of American paleontology. Glossaulax vesicalis Glossaulax reiniana. Glossaulax bicolor Text-figure 20. —Basal views of (1-3) Glossaulax didyma didyma (Roding, 1 798). (4) G. vesicalis (Philippi, 1848), (5) G. reiniana (Dunker. 1877). and (6) G. bicolor (Philippi. 1848). Umbilical characters of G. didyma didyma: a shallowly but widely incised spiral groove (arrow a) on the umbilical wall and a shallowly incised transverse callus groove crossing to the inner margin of the aperture at an acute (angle A) to a right angle (angle B). Glossaulax vesicalis: a weakly angular base (arrow d) and a minutely to strongly incised umbilical callus groove crossing to the inner margin of the aperture at an obtuse angle (angle C). Glossaulax reiniana: a greatly incised spiral groove (arrow e) on the umbilical wall. Glossaulax bicolor. an umbilical wall beanng two spiral steps (arrow c) and an entirely rounded base.. 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 work.. Paleontological Research Institution (Ithaca, N. Y. ); Columbia University. Ithaca, N. Y. , Paleontological Research Institution [etc. ]