. The Devonian crinoids of the State of New York. Crinoidea, Fossil; Paleontology; Paleontology. 20 NEW YORK STATE MUSEUM. Three stages in the evolution of the tegmen, according to Bather ( 1900), are shown in figure 13. The tegmen in its simplest form has the five orals; but usually more or less rounded covering-plates or ambulacrals P are present. These plates cover the grooves which extend over or between the apposed edges of the orals to the arms. On the arms the covering plates are separated from the brachials and pinnulars "L 3 by oblong or squarish plates Figure 13 Three stages in
. The Devonian crinoids of the State of New York. Crinoidea, Fossil; Paleontology; Paleontology. 20 NEW YORK STATE MUSEUM. Three stages in the evolution of the tegmen, according to Bather ( 1900), are shown in figure 13. The tegmen in its simplest form has the five orals; but usually more or less rounded covering-plates or ambulacrals P are present. These plates cover the grooves which extend over or between the apposed edges of the orals to the arms. On the arms the covering plates are separated from the brachials and pinnulars "L 3 by oblong or squarish plates Figure 13 Three stages in the evolution of the tegmen known as Side plateS Or adam- (according to Bather). I, orals only, O; 2, orals and , . ambulacrals, Amb; 3, orals (interradial plates of OlUacrals. 1 hese Side plates OCCUT Springer), ambulacrals and enlarged peristomial [n most Qf tfre Imdunata and ambulacrals, P, (orals of Wachsmuth and Springer). R, radial; As, anus; x, anal plate; M, madreporite. Flexibilia, but are rarely repre- (After Bather, 1900). sented ^ the Camerata Ambu. lacrals (and accompanying plates, if present) become irregular and ill-defined on the tegmen. Modifications of the tegmen accompany modifications of the dorsal. 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 Goldring, Winifred, 1888-1971. Albany : University of the State of New York
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpaleont, bookyear1923
