. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 30 J. E. DUERDEN. phyllum represent a developmental stage when compared with the mature condition of such a form as Strcptelasma ; as in the case of the alar fossulae, a developmental stage in Streptdasma persists as the adult condition in Hadrophyllum. The axial car- dinal fossula of Hadrophyllum. is thus shown to be associated with two groups of incompletely developed septa, a group on each side of the cardinal directive septum, while at the same time the latter is much smaller than the other primary septa. Such a a FI
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 30 J. E. DUERDEN. phyllum represent a developmental stage when compared with the mature condition of such a form as Strcptelasma ; as in the case of the alar fossulae, a developmental stage in Streptdasma persists as the adult condition in Hadrophyllum. The axial car- dinal fossula of Hadrophyllum. is thus shown to be associated with two groups of incompletely developed septa, a group on each side of the cardinal directive septum, while at the same time the latter is much smaller than the other primary septa. Such a a FIG. 9. Exosepta (.r) have now appeared in association with most of the fully developed septa, namely, all the protosepta (except the ventral directive) and the metaseptal pairs a and b. The exosepta are at first turned towards and fused with their corresponding dorsal entoseptum. fossula as a whole may be spoken of as compound, while those in the two alar regions are simple fossulae. Studies on other species of rugose corals show that throughout the group the cardinal fossula in the adult calice is constituted either on the Hadrophyllum or Strcptelasma plan ; rarely, as in Anisophyllum, the cardinal directive septum is much larger than the other primary septa and then the fossula is really double, a. 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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