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Hall, James; 1811-1898 / Geological survey of Wisconsin, 1859-1863. Palaeontology. Part third
(1871)

Plate XIII,   pp. [unnumbered]-Plate XIII PDF (735.8 KB)



                              PLATE XIII -Continued.
            PENTAMERUS (PENTAXERELLA?) VENTRICOSUS, HALL
                                       Page 382.
FIGS. 18-21. Dorsal view, profile, cardinal and front views of a medium-sized
individual of the
              species, showing slight indications of plications on the mesial
fold and sinus.
                      PENTAMERUS MULTICOSTATuS, HALL.
                                       Page 381.
FIGS. 22-24. Dorsal view, profile, and cardinal views of an internal cast
of this species, preserving
             the impressions of the costs on the anterior margin.


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