On the structure and affinities of the genus Monticulipora and its sub-genera, with critical descriptions of illustrative species . Fig. 23.—Minute structure of 3/. siibpulchcUa, Nich., from the Cincinnati Group of Ohio. A, Part of a tangential section, embracing one of the maculae, enlarged eighteen times ; B, Small portion of the same section, enlarged fifty times; c, Vertical section of thecorallum, enlarged six times, showing the different structure of the corallites in the axialand peripheral portions of their course respectively ; D, Part of the preceding section,enlarged eighteen times.
On the structure and affinities of the genus Monticulipora and its sub-genera, with critical descriptions of illustrative species . Fig. 23.—Minute structure of 3/. siibpulchcUa, Nich., from the Cincinnati Group of Ohio. A, Part of a tangential section, embracing one of the maculae, enlarged eighteen times ; B, Small portion of the same section, enlarged fifty times; c, Vertical section of thecorallum, enlarged six times, showing the different structure of the corallites in the axialand peripheral portions of their course respectively ; D, Part of the preceding section,enlarged eighteen times. corallum have thickened walls, and are apparently completelyamalgamated with one another. The average corallites are 136 THE GENUS MONTICULIFORA. polygonal or sub-polygonal in form, and interspersed amongthem we see a variable number of much smaller tubes, togetherwith an occasional thick-walled spiniform corallite. Theclusters of small tubes, which are so conspicuous at the surface,are readily recognised in tangential sections, provided these arenot made at too great a depth. In vertical sections taken at right angles to
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Keywords: ., bookauthornicholso, bookcentury1800, bookdecade1880, bookyear1881
