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

II. Descriptions of fossils of the Niagara group,   pp. 7-90 PDF (23.8 MB)


Page 7


II. DESCRIPTIONS OF FOSSILS OF THE NIAGARA GROUP.
                      ECHINODERMATA.
  In the Report of Progress of the Geological Survey of Wisconsin for 1860,*
I described several species of Crinoidea, two Cystideans, several species
of Brachiopoda, Gasteropoda and Cephalopoda, from the limestones of
Racine and Waukesha; leaving a considerable number of species unde-
scribed for want of satisfactory material. It has not been in my power
to make such collections as I then anticipated; and the following descrip-
tions relate almost exclusively to species that have been in my cabinet
for several years, and which were studied, and many of them determined,
at the time of making the report above cited.
  Some of the Crinoidea are very interesting; but the Cystideans possess
a peculiar interest, as offering forms which, so far as I know, have not
been discovered in any other localities. The specimens, with few excep-
tions, are casts of the interior of the test, or impressions of the exterior
left in the matrix. A few of the species retain the plates to such an
extent that the structure can be determined. Since it appears probable
that we shall, for some time at least, be dependent upon similar imperfect
materials for our knowledge of these fossils, I shall endeavor to give
such descriptions as will enable the student to recognize the species, with
the hope that some of them at least will be illustrated at a future period.
                GENUS GOMPHOCYSTITES, N. G.
                       [yojoeo, clavus; Kcv-iou, vesica.]
Body elongate pyriform, very narrow at the base, gradually enlarging
    above, and inflated near the upper extremity. Surface composed of
    numerous series of polygonal plates which have a spiral arrange-
    ment. Apertures upon the upper surface, one of them being
    subcentral, and the other a little eccentric. Arms sessile, lying in
    grooves excavated in the surface of the plates, originating near the
    * Report of the Superintendent of the Geological Survey, Legislative
Documents, 1861.
                                   IV/


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