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

Plate XXIV,   pp. [unnumbered]-Pl. 24 PDF (791.7 KB)



PLATE XXIV.
                         ORTHOCERAS COLUIMNARE, HALL.
                                        Page 411.
FIG. 1. View of a very fine specimen of this species, showing the surface
markings, form of the
            septa, size and proportions of the siphuncle. From a specimen
in the collection of
            Prof. Marcy.
                       ORTHOCERAS ANNULATUM, SOWERB Y.
                                        Page 411.
FIG. 2. A specimen (a cast of the interior) of this species, showing the
septa and siphuncle.
a   3. A fragment, showing the angular form of the annulations and the lines
of the septa.
"   4. A fragment, showing the transverse or concentric undulating strive,
and the longitudinal
            ridges, forming nodes where they cross the annulations.
                          CYRTOCERAS LATERALE, HALL.
                                        Page 407.
FIG. 5. View of a specimen of this species, showing a few of the septa, and
the outer chamber
            strongly constricted below the aperture. This figure is erroneously
referred in the
            text to 0. alienum.
                           ORTEOCERAS ALIENUx, HALL.
                                        Page 414.
FIG. 6. View of a cast of the outer chamber of this species, showing the
gradually tapering form
            and the broad constriction near the aperture.
 "   7. A section of a fragment, showing the septa and siphuncle.


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