. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 266 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY Form Ratio M. copha (Atokan) M. lepta (Desmoinesian) M. wyomingensis—~- (Missourian) M. miopetina—- 10 () M. pliopetina (L. Permian). M. copei—»— (L. Permian) (Missourian) — M glossoidea (Virgilian) M petina (U. Virgilian) I i i_ Ratio Lfi:L<* Fig. 3. Evolutionary trends of myalinid shells represented by species from Pennsylvanian and Lower Permian strata of the midcontinent region. The form ratio (shell length to sh
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 266 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY Form Ratio M. copha (Atokan) M. lepta (Desmoinesian) M. wyomingensis—~- (Missourian) M. miopetina—- 10 () M. pliopetina (L. Permian). M. copei—»— (L. Permian) (Missourian) — M glossoidea (Virgilian) M petina (U. Virgilian) I i i_ Ratio Lfi:L<* Fig. 3. Evolutionary trends of myalinid shells represented by species from Pennsylvanian and Lower Permian strata of the midcontinent region. The form ratio (shell length to shell height) of species is plotted against the ratio of angle beta to angle alpha (inserted diagram A). Taking account of stratigraphic occurrence, two main trends seem to be derived from Myalina lepta of Desmoinesian age (data from Newell 1942).. 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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