. The Annals and magazine of natural history; zoology, botany, and geology. Dr. A. KorotnefF o?i Polypavium ambulans. 215 oesophagus (fig. I.). The relation of the musculature on the directional septa is different from that on other septa—the transverse muscles are directed towards them, the longitudinal from them. Thus, with the directional septa it is exactly as Fio-. Transverse section tliroiigh a young Adamsia diaphana : tmv, mouth- angles; rs, directional septa; Im, longitudinal muscles. (After Hertwig.) in the interior chambers of Polyparium^ which is certainly not without significan
. The Annals and magazine of natural history; zoology, botany, and geology. Dr. A. KorotnefF o?i Polypavium ambulans. 215 oesophagus (fig. I.). The relation of the musculature on the directional septa is different from that on other septa—the transverse muscles are directed towards them, the longitudinal from them. Thus, with the directional septa it is exactly as Fio-. Transverse section tliroiigh a young Adamsia diaphana : tmv, mouth- angles; rs, directional septa; Im, longitudinal muscles. (After Hertwig.) in the interior chambers of Polyparium^ which is certainly not without significance and needs homologizing. Unfortunately embryology gives us no data for this purpose, because the re- searches of Kowalevsky f and Lacaze-Duthiers \ upon this subject do not thoroughly exhaust the question and are in contradiction to each other. We must therefore treat this question quite a priori. Very probably the directional septa of the Actiniee are the first formed ; they will probably be arcMsepta; and this postulate is to a certain extent confirmed by the fact that the directional septa undoubtedly correspond to the four longitudinal muscles of the Scyphistoma. In the t A. Kowalevsky, '' Unterschungen tiber die Entwicklung der Coelen- teraten," in Nachr. k. Ges. der Freuude der Natui', Anthr. und Ethnoo-r. Moscow, 1873 (in Russian). J Lacaze-Duthiers, " Developpement des Coralliaries," in Arch. Zool. exper. et g6n. tome i. 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 London, Taylor and Francis, Ltd
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