. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 28 J. E. DUERDEN. THE ALAR OR LATERAL FOSSUL/E. We may first enquire into the nature of the alar or lateral fos- sulae, as represented in the calice of a rugose coral such as Ha- o-. FIG. I. Calice of Hadrophyllitm panciradiatnm, E. & H., showing the arrange inent of the septa. Here and throughout the figures the Roman numerals I indicate the six primary septa or protosepta, the letters a-e the secondary septa or metasepta, and x the exosepta making up the outer smaller cycle (see description, Fig. 7) ; the lower side is
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 28 J. E. DUERDEN. THE ALAR OR LATERAL FOSSUL/E. We may first enquire into the nature of the alar or lateral fos- sulae, as represented in the calice of a rugose coral such as Ha- o-. FIG. I. Calice of Hadrophyllitm panciradiatnm, E. & H., showing the arrange inent of the septa. Here and throughout the figures the Roman numerals I indicate the six primary septa or protosepta, the letters a-e the secondary septa or metasepta, and x the exosepta making up the outer smaller cycle (see description, Fig. 7) ; the lower side is regarded as ventral and the upper as dorsal. The two alar fossulse are formed by the medio-lateral group of shorter septa, c-e, on each side, and the cardinal fossula by the ventro-lateral group of shorter septa, b-e, on each side, along with the more depressed ventral directive septum (I). The series, Figs. 2-11, shows the complete septal development of Streptelaswa rectum, Hall. The drawings were made as the successive stages were exposed on grinding down a corallite ; the middle dotted line in each septum represents the line or centers of calcification. drophyllum paudradiatum (Fig. i). The Devonian genus Ha- drophyllum here chosen is one which Milne-Edwards and Haime,. 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
Size: 1583px × 1579px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
