On the structure and affinities of the genus Monticulipora and its sub-genera, with critical descriptions of illustrative species . regularly rounded apertures of alargely developed series of small interstitial corallites. As regards internal structure, the corallites are at first thin-walled, but become thickened in the outer part of their course,their walls becoming at the same time seemingly fused small angular interstitial corallites occupy all the intervalsleft between the oval or rounded large tubes, and there is alargely developed series of thick-walled hollow tubuli ( spin
On the structure and affinities of the genus Monticulipora and its sub-genera, with critical descriptions of illustrative species . regularly rounded apertures of alargely developed series of small interstitial corallites. As regards internal structure, the corallites are at first thin-walled, but become thickened in the outer part of their course,their walls becoming at the same time seemingly fused small angular interstitial corallites occupy all the intervalsleft between the oval or rounded large tubes, and there is alargely developed series of thick-walled hollow tubuli ( spini-form corallites), placed at the angles of junction of the normalcorallites. Tabulae are wanting, or are very sparingly devel-oped in the axial region of the branches, but are abundantlypresent in the outer portion of the tubes, and are much moreclosely set in the small interstitial corallites than in the largeones. In all cases, the tabuLx are complete and approximatelyhorizontal. 132 THE GENUS MONTICULIPORA. Obs.—In common with various American observers, I haveformerly identified the present form with the AI. Flctchcri,. iMg. 22.—Moiiticuliporci Ulrichii, Nich. (the so-called M. Flctchcri of the Cincinnati forma-tion). A, A fragment of the corallum of the natural size ; ]., Part of the surface, enlargedeighteen times ; C, Tangential section of the same, similarly enlarged ; D, Part of atangential section, enlarged fifty times, showing the two sets of corallites, and the tubularspines ; E, Part of a vertical section, enlarged eighteen times. From the CincinnatiGroup, Cincinnati, Ohio. Edw. and Haime, of the Wenlock Limestone of Britain.^ Iam, however, now satisfied that the examples from the Cin-cinnati Group certainly cannot be properly thus identified, withour present knowledge. We are not at present acquaintedwith the minute structure of the type-specimens upon whichthe distinguished French writers above mentioned founded thespecies ]\I. Flctchcri, so that any identif
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Keywords: ., bookauthornicholso, bookcentury1800, bookdecade1880, bookyear1881
