. A manual of zoology. Zoology. B Fig. 194. Fig. 195. Fig. 194.—Transverse section of actinian {Adamsia diaphana) AB, plane of sym- metry, a second lies at right angles. I-IV, septa of four orders. Fig. 195.—Transverse section of an Octocorallan {Alcyoniitm'). .y, siphonoglyphe; 1—4, septa of one side, with their muscles on one side, symmetrical with those of the other side. In the Octocoralla only eight septa are developed. These are disposed equally on either side of the oesophagus and may have (most octocorallans) all their muscles towards one end (tig. 195) or {Edwardsia, fig. 196, IV) hav
. A manual of zoology. Zoology. B Fig. 194. Fig. 195. Fig. 194.—Transverse section of actinian {Adamsia diaphana) AB, plane of sym- metry, a second lies at right angles. I-IV, septa of four orders. Fig. 195.—Transverse section of an Octocorallan {Alcyoniitm'). .y, siphonoglyphe; 1—4, septa of one side, with their muscles on one side, symmetrical with those of the other side. In the Octocoralla only eight septa are developed. These are disposed equally on either side of the oesophagus and may have (most octocorallans) all their muscles towards one end (tig. 195) or {Edwardsia, fig. 196, IV) have one pair reversed. It is to be noted that hexactinians pass through an Edwardsia stage. In Cerianthus new septa are always added at one end of the sagittal axis (fig. 196, II), while in the extinct Tetracoralla (I), so far as one may judge from the hard parts, the septa have an arrangement with four as the basis. Most Anthozoa reproduce by division or budding as well as by eggs. Occasionally the buds separate; usually they remain connected with the mother, forming colonies of hundreds or thousands of individuals, con- nected by a ccenosarc, consisting largely of mesoglcea with a covering. 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 Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterling), 1854-1929, ed. and tr. New York, H. Holt
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1912
