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 Corals of Delafield. 1SR author states that the number of rays found on these star-like prominences is from eight to twelve. Ours display from five to eighteen of these processes. The raised hexagonal border which he notes in the interspaces between the stars is shown in but a single specimen in our collection, and only imperfectly there. The star-like prominences in our specimens are much more irreg- ular in form and arrangement, and the pores occupying the inter- stellar spaces have plainly-marked raised rims as in the genus Trematopora heretofore described. Closely resembling this species in some of its forms stands a newly described species Jilonticulzporacpunctata, (An. iReport, Wis. Geol. Sur. p. 71). This is a very variable form, especially as to surface markings. It is a cylindrical, branching coral, the stems varving from one-eighth to three-fourths of an inch in diarrmeter. Some specimens display tubercular prominences very closely resembling those of the form last described; others show none of these raised figures. The surface of all specimens referred to this species is studded with non-cellular, minutely porous interspaces separated by surfaces marked by cells and pore-marked walls, just such as are shown by representatives of the genus Fistulipora. About these interspaces the larger cells are sometimes arranged in radiating lines or ridges. In these forms the resemblance to S&ellipora is very marked to the unas- sisted eye. Under the lens, however, the arrangement of cells, cell walls and porous surfaces of cell walls and interspaces brings out the resemblance to the other genus just mentioned. The only marked difference between this form and those described as lisltuhbora is the presence and prominence of the interspaces, and these are mentioned by Dr. Rominger, of Michigan, as character- iqtic of the latter genus. - This author would doubtless place it at once under that genus. We present also three other very closely allied forms of the genus Jlfonlt~ouic poa. These are nearly alike in mode of growth, of branching, and in thickness of cell walls. A detailed description of the first species will serve as a basis for all. Prof. Whitfield describes it as growing in strong, solid, somewhat flattened, frequently branching stems, covered with
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