. The Devonian crinoids of the State of New York. Crinoidea, Fossil; Paleontology; Paleontology. 338 NEW YORK STATE MUSEUM Large radials, the anterior and left posterior, with a maximum length of mm. Their common suture is mm in length. Left anterior inferradial subtriangular in shape and quite small; width mm along the hinge area, height mm. Left anterior superradial has a width of mm and a height of mm. Radial suture straight and occupies the entire width of the superradial. Radianal and right anterior inferradial fused, forming a plate mm in width, which rests in
. The Devonian crinoids of the State of New York. Crinoidea, Fossil; Paleontology; Paleontology. 338 NEW YORK STATE MUSEUM Large radials, the anterior and left posterior, with a maximum length of mm. Their common suture is mm in length. Left anterior inferradial subtriangular in shape and quite small; width mm along the hinge area, height mm. Left anterior superradial has a width of mm and a height of mm. Radial suture straight and occupies the entire width of the superradial. Radianal and right anterior inferradial fused, forming a plate mm in width, which rests in shallow excavations in the anterior and left posterior radials. Proximally upon it rests the posterior and right anterior basals, while distally it connects with the broad anal x. Hinge area well exposed in IB LB. the larger specimen, and on plate 41, figure 9, will be found a semi-diagrammatic figure (x 3) of this structure. From this figure and figure 8 on the same 56 57 Figure 56 Halysiocrinus secundus. Enlargement (x 4) showing basals and stem attachment. (See plate plate, as Well as text figures 56, 41, figures 6, 7). For labelling, see figure 55. â. tt 1 ⢠â ^ XT- S7» it will be seen that the tol- rigure 57 Halysiocrinus secundus. Hinge area ^' ' (x 3). (See plate 41, figures 8, 9). /. a. Ri, left anterior lowing plates take part in form- inferradial; other labelling as in figures 54, 55. . mg the hinge line: left postenor basal and left anterior basal (fused), posterior basal, right anterior basal1 anterior inferradial, left posterior radial, and anterior radial. Hinge line straight, except that in the middle there is a crescentic notch in that portion of the hinge formed by the basals. This is shown in figure 9, plate- 41, where the opening appears somewhat to one side of the middle, owing to a slight disarrangement of the plates. Opening doubtless functioned as a passage for the nutrition and enervation of the muscles and ligaments of the hinge area.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpaleont, bookyear1923
