. Catalogue of the madreporarian corals in the British Museum (Natural History). Scleractinia. "00-'1. D Fig. 3. DiaTams illustrating the structure of the theca of Porites. A, an ideal vertical section through a simple walled calicle of a colony; w, the wall trabecula; sg, the septal oranule ; p, the palus ; d, the central tubercle (these three are seen, like u\ to be the tips of trabecule). B, a horizontal section of a calicle in a colony in which the thecae are slightly separated so that the synapticulse joining the wall trabeculse (to') with those of adjacent calicles {w-) have a zigza
. Catalogue of the madreporarian corals in the British Museum (Natural History). Scleractinia. "00-'1. D Fig. 3. DiaTams illustrating the structure of the theca of Porites. A, an ideal vertical section through a simple walled calicle of a colony; w, the wall trabecula; sg, the septal oranule ; p, the palus ; d, the central tubercle (these three are seen, like u\ to be the tips of trabecule). B, a horizontal section of a calicle in a colony in which the thecae are slightly separated so that the synapticulse joining the wall trabeculse (to') with those of adjacent calicles {w-) have a zigzag course. C, a vertical section through a compound wall, which appears when the simple walls (w) are far enough apart to admit of an inter- vening trabecula, in this case figured as rising above the walls (w) as a wall-ridge {m), making w look like another granule of the septal edge (the "wall granule"). D, an ideal parent calicle to explain the origin of intervening trabecule ; they are homologous with costal trabeculae (c), one or more of which are able to appear if the calicles in a colony are far enough apart to admit them ; ep, epithecal saucer or prototheca. for the most part as if complete, although those of the wall and septa are usually interrupted by perforations seen in the septa in A. The radial junctions seen in B are septal; the con- centric junctions forming the wall, and running here and there between the pali, and, again, as if starting, but seldom meeting, between the septal granules, are synapticular. This is apparently the simplest and commonest type of structure met with in Porites, so far as the inner aspect of the theca is concerned. And though nearly all Porites appear alike. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). Dept. of Zoology;
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