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)
The Coralis of J)elafield. 187 The genus is thus described by Dr. Hall: " A foliaceous branch- ing coral, supported by smooth rootlike expansions; branches bifurcating and sometimes coalescing, celluliterous on both sides, with thin central axis. Cellules, oval tubes, not enlarged below apertures, distinctly oval with raised borders, nearly as wide as the cells within. The distinctive features of these species lie in the mode of branching, size, shape and arrangements of the cells. Their re- semblance to modern Bryozoan forms is manifest. This resem- blance is still more plainly seen in the reticulated forms represented by Fige. 3 and 4.' These are incrusting forms with the cells on I These figures refer to drawings placed before the association at the pres- entation of this paper in December, 1878. Some of the corals will be illus- trated in Vol. IV, Wis. Geol. Surv. one side only. Fig. 3 is an undescribed species, referred to the genus Jietopora by Professor Whitfield. Fig. 4 was described by Professor Whitfield, and his description is found in the annual report of the Wisconsin Geological Survey for 1877, p. 68, under the name Ienestela y)uanulosa. The more obvious characters of each form are as follows: The Retopora presents anastomosing branches with irregular, elliptical or linear, pointed meshes, upper surface of branches thickly covered with circular pores which are arranged in three or four longitudinal rows. In the Fenestella the branches do not reunite after separa- tion, but frequently bifurcate and are connected at quite regular intervals by extremely narrow bars which divide the interspaces into ob'ong spaces or fenestrules. The pores in this form are ar- ranged in lines, a single row on each margin of the branches or rays. The opposite surface of the frond is densely covered with very minute granules, hence the term granalosa, applied to the species. Turning to those forms which more closely resemble living radiate corals, we notice first of all the delicately formed Trernatopora ann?,lifer, Whitfield, described in the Annual Re- port Wisconsin Geological Survey for 1877, page 67. Scores of fragments of this beautiful fossil are found imbedded in
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