. Annual report. New York State Museum; Science; Science. 152 NEW YORK STATE MUSEUM Inocaulis arbuscula Ulrich. Ibid. Calyptograptus ? arbusculus Spencer. Acad. Sci. St Louis Trans, v. 4 (bull.) 1884. p. 563 Dictyonema arbusculum Gurley. In J. F. James, Cin. Soc. Nat. Hist. Jour. 1892. Inocaulis arbuscula Gurley. Jour. Geol. 1896. 4:300 Dictyonema arbusculum Nickles. Cin. Soc. Nat. Hist. Jour. 1902. 20:72 Description. Rhabdosome small (15+ mm), flabellate or infundibuli- form, rapidly expanding by successive bifurcations, the branches diverging from 6o°-70°, narrow (.3 mm), gently undula
. Annual report. New York State Museum; Science; Science. 152 NEW YORK STATE MUSEUM Inocaulis arbuscula Ulrich. Ibid. Calyptograptus ? arbusculus Spencer. Acad. Sci. St Louis Trans, v. 4 (bull.) 1884. p. 563 Dictyonema arbusculum Gurley. In J. F. James, Cin. Soc. Nat. Hist. Jour. 1892. Inocaulis arbuscula Gurley. Jour. Geol. 1896. 4:300 Dictyonema arbusculum Nickles. Cin. Soc. Nat. Hist. Jour. 1902. 20:72 Description. Rhabdosome small (15+ mm), flabellate or infundibuli- form, rapidly expanding by successive bifurcations, the branches diverging from 6o°-70°, narrow (.3 mm), gently undulating or curvilinear in direction in the proximal portion, forming long oval meshes, principally by contact, but becoming straighter more distally and then probably forming dissepiments. Thecae projecting, forming distinct den- ticles, numbering about 13 in 10 mm. Sicula not observed. Position and locality. Ulrich records it from the Middle third of the Eden shale at Covington, Ky. and Nickles in his " Geology of Cincinnati" \loc. cit. \ lists it as a fossil of the middle Utica or Batostoma jamesi beds. Remarks. This species has been twice described, first by Ulrich [1879J, who noted the presence of the denticles, and then by Gurley [1892], who recorded the curvilinear direction of the branches and the presence of dissepiments. We figure here an enlargement of a well preserved specimen (metatype) of the Ulrich collection from which we have obtained the above given diagnosis. The specimens give the impres- sion of being but the proximal portions of larger rhabdosomes for they. Fig. 57i 58 Dictyonema arbuscula (Ulrich). Fig. 57 Copies of original drawings. Fig. 58 En largement (x 5) of authentic specimen. Original in Ulrich collection. 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 New York State M
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