V.—Some Observations on the Zoantharia Rugosa

Open Access
Publisher Website
Google Scholar
Abstract
Professor Steenstrup, some years ago, questioned the fact as to whether the Zoantharia tabulata and rugosa, included by him under the common name of “Cyathophylla,” might be considered as true polyps. MM. Edwards and Haime in framing those great subdivisions of their “Coralliaria,” remarked their striking dissimilarity from the other Actinozoa. Professor Agassiz, in his grand monograph on the Acalephæ of North America, considers these differences so important that henceforth all connection between the above-named groups and the Zoantharia aporosa and perforata will be impossible. But besides these peculiar characteristics of the Rugosa, such, for instance, as the compact imperforate structure of the calyx and septa (the septa originating from four primary ones), the absence of costæ, the strange septal fossæ in the bottom of the calyx, the processes resembling rootlets, the transverse floors or tabulæ in the interior, which often have a cellular or vesicular structure; there is another peculiarity as yet not much known.

This publication has 0 references indexed in Scilit: