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Transactions of the Wisconsin Academy of Sciences, Arts and Letters
volume V (1877-1881)

Buel, Ira M.
The corals of Delafield,   pp. 185-193 PDF (2.5 MB)


Page 192


192    Wisconsin Academy of Sciences, Arts and Letters.
formed by the grouping in various ways of beautifully trilobate
semi-circular walls, after the manner of the fancy designs known
by the ladies as shell-work. The appearance of the surface is
more suggestive of modern Bryozoans than any other form. I
should judge that it belongs to the genus Alveolites. Another
well marked but undescribed fossil is doubtless a l1isYluipora.
The manner of growth of this form is various. It sometimes
appears as an incrusting coral, sometimes grows out into thin
fronds, again is found in irregularly-lobed masses, and occasion.
ally takes the form of solid cylindrical branches. Its compara-
ti-1lw 1anr {.lC £R to,- Q in to r~ra  of  lno nro bllirntir in
i 
~ !U'Li~  N )1K  U;~~U  s tI1' tK
livuly lV¢: -;1b     ULO     -O 111... -idtUL -,17; et-t;il~l;
outline and have prominent thin walls. These cells are irrec
larly scattered over the surface, sometimes in cnntact but ofter
separated by interspaces which are studded with smaller circu
or polygonal cellules. These are of very unequal size and se,
to have no systematic arrangement. The sharpness of outli
possessed by cells and cellules in this form makes it one of 1
handsomest of these little curiosities.
  From the facts observed during my examinations of the
fossils, and especially from that portion which has been here
presented, the following conclusions have been drawn:
  1. Throughout the whole series here represented we find
strongly marked lines of separation, but rather a group of for
bound together by many points of similarity.
  2. These relationships preclude the possibility that we ha
here the representatives of two sub-kingdoms.
  3. The close relationship borne by some of these corals to for
distinctly radiate would seem to indicate that they hold an int
mediate position between the radiate and molluscan sub-kir
doms. It would be a hopeless task to attempt to establish th
exact relationships from these fragmentary skeletons.
  4. The extreme variability exhibited by the fossils themselv
precludes the existence of well defined genera and species, a
points out an error in the past whereby these arbitrary distii
tions have been unnecessarily multiplied.
  5. The most careful study of extended collections is necessa
to enable the observer to fix the few distinguishing lines by whi


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