. Annual report of the Regents. New York State Museum; Science. 578 Report of the State Geologist. region the cell walls are very thin, and the diaphragms are com- paratively distant. In the peripheral region the walls are much thickened and the diaphragms are much more numerous ; surface with slightly elevated monticules, having cell apertures a little larger than those on other portions of the frond. Deka^yia, Edwards and Haime. (Mon. de Pol. Foss. de Terr. Pal, p. 127. 1851.) Type, Dekayia aspera, Edwards and Haime. Zoarium ramose, branches cylindrical or flattened; cells tubular, polygonal
. Annual report of the Regents. New York State Museum; Science. 578 Report of the State Geologist. region the cell walls are very thin, and the diaphragms are com- paratively distant. In the peripheral region the walls are much thickened and the diaphragms are much more numerous ; surface with slightly elevated monticules, having cell apertures a little larger than those on other portions of the frond. Deka^yia, Edwards and Haime. (Mon. de Pol. Foss. de Terr. Pal, p. 127. 1851.) Type, Dekayia aspera, Edwards and Haime. Zoarium ramose, branches cylindrical or flattened; cells tubular, polygonal, arising from an imaginary axis at the center of the branch, gradually diverging until near the surface, when they abruptly, turn outward. In the axial region the walls are very thin, and the diaphragms are very infrequent or entirely wanting. In the peripheral region the cell walls are much thickened and the diaphragms are of moderately frequent occur- rence, the walls becoming moniliform. The cell apertures are polygonal and have numerous spines (acanthopores) at the angles; surface with numerous maculae, the cell apertures of which are larger than those on other portions of the frond. 142 143. Fig. 141. Dekayia devonica, natural size. Fig. 142. Vertical section, xl8. Fig. 143. Surface, xl8. Fig. 144. Transverse section, x36. Heterotrypa, ]S^icholson. • (Pal. Tab. Corals, p. 291. 1879.) Type, Heterotrypa mammulata, Nicholson. Zoarium consisting of large lobate or frondescent expansions; cells tubular, polygonal, arising from an imaginary axis, gradu-. 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 Museum; University of the State of New York. Board of Regents. Albany : J. B. Lyon, State Printer
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Keywords: ., bookauthorne, bookcentury1800, bookdecade1880, booksubjectscience
