. Bulletins of American paleontology. . Figure 2. Arctangia nathorsti (Lindstr.) a. Corallum, xl. b. Calice, x8. c. Vertical section along a primary septum, x8. d. Tertiary septum, xS. e. Transverse section near base, xS (After Lindstroem). Diagnosis.—Simple astrangid, irregularly turbinate, small, fixed by a small base. Wall epithecal, non-costate, internally thickened by stereoplasm. Septa non-exsert, uniting, all irregu- larly dentate, the dentations subspinose. Columella parietal, formed by inner ends of the septa, upper surface composed of papillae merging with inner septal dentations. En
. Bulletins of American paleontology. . Figure 2. Arctangia nathorsti (Lindstr.) a. Corallum, xl. b. Calice, x8. c. Vertical section along a primary septum, x8. d. Tertiary septum, xS. e. Transverse section near base, xS (After Lindstroem). Diagnosis.—Simple astrangid, irregularly turbinate, small, fixed by a small base. Wall epithecal, non-costate, internally thickened by stereoplasm. Septa non-exsert, uniting, all irregu- larly dentate, the dentations subspinose. Columella parietal, formed by inner ends of the septa, upper surface composed of papillae merging with inner septal dentations. Endotheca present but sparse. Remarks.— The members of the Astrangiidae as a rule form reptoid, cerioid or plocoid colonies, and the new genus is the only one, so far as it is known at present, that is strictly solitary in habit. Its nearest relationships are with Rhizangia, a genus ranging from the Upper Cretaceous into the Miocene of Europe. Rhizangia, however, formed reptoid colonies of low corallites united by permanent calcareous stolon-like expansions of the edge-zone under which the epitheca was lost. Cryptangia (Mio- cene-Pliocene, Europe) is another genus which may be related to Arctangia, but although the individual corallites closely resemble aoLindstroem, G. On Thecocyathus nathorsti a. sp., a Neocomian coral from King Charles Land. KongL Vetenslcaps-ATcad. Forhandl. 1900 No. 1, 7-12, text figs. 1-8. Stockholm. 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 Paleontological Research Institution (Ithaca, N. Y. ); Columbia University. Ithaca, N. Y. , Paleontological Research Institution [etc. ]
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