The Annals and magazine of natural history; zoology, botany, and geology . v Monticulipora ? tumida, Phill., from the Carboniferous rocks ofRedesdale, Northumberland. A. Part of a tangential section, enlargedtwenty-four times, showing the large and small corallites, and the rowsof interstitial spiniforrn tubules. Part of a transverse section, enlargedtwenty-four times, showing the polygonal and thin-walled axial tubesand the thickened walls and complete tabulae of the peripheral portionsof the corallites. The only two remaining structural points to notice concernthe nature of the tabulas a
The Annals and magazine of natural history; zoology, botany, and geology . v Monticulipora ? tumida, Phill., from the Carboniferous rocks ofRedesdale, Northumberland. A. Part of a tangential section, enlargedtwenty-four times, showing the large and small corallites, and the rowsof interstitial spiniforrn tubules. Part of a transverse section, enlargedtwenty-four times, showing the polygonal and thin-walled axial tubesand the thickened walls and complete tabulae of the peripheral portionsof the corallites. The only two remaining structural points to notice concernthe nature of the tabulas and the thickening of the walls of themature corallites. As to the first of these two points, it isquite certain that the tabulas are essentially and habituallycomplete and imperforate (fig. 3, B). In no single longitudinalor transverse section have I ever detected an incompletetabula, and out of a large number of tangential sections I haveonly once met with an instance of a perforated tabula, andthen only in one or two corallites. As to the second point, the walls of th
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