Phosphatic calculi in silurian polyzoa

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Abstract
In 1884 Etheridge and Foord published a detailed description of the Polyzoan Favositella interpuncta (Quenstedt) from the Wenlock Limestone of Dudley, remarking on its “mural pores,” which were exceptionally large and showed a somewhat irregular distribution. The authors observe that frequently these “mural pores” have been filled with concentric layers of material, which they state to be chalcedony, and that the “pores” are often so conspicuous that on a polished surface they are clearly visible with the aid of a hand-lens. It was the presence of these so-called pores which led the authors to assign this species to the Favositidæ, in spite of its obvious monticuliporoid appearance. At that time this was not regarded as a fundamental issue, for in this country the Monticuliporoids were still classed with the Tabulate corals. Here the matter rested until 1911 when Baltic Provinces.” In the course of this research Bassler had carefully examined topotype material of F. Interpuncta , and showed conclusively that it was congeneric with those Ceramoporoid Polyzoa formerly included in the genus Bythotrypa -a name which had been proposed by Ulrich in 1893, and which therefore had to be suppressed in favour of Favositella (Etheridge and Foord, 1884).

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