. Cincinnati quarterly journal of science. Science; Science -- Ohio. 278 Glyptocrinus Shafferi. on the upper sloping sides, the free rays of the crinoid. The radials form a longitudinally convex elevation above the interradials, which give the short body a somewhat pentagonal appearance. Only three interradial plates appear in the figure, and, though I have examined several, otherwise, very good specimens, I have been unal)le to discover the outlines of more than three plates; but from these examinations, I am led to believe, that there are six interradial plates or minute pieces arranged abou
. Cincinnati quarterly journal of science. Science; Science -- Ohio. 278 Glyptocrinus Shafferi. on the upper sloping sides, the free rays of the crinoid. The radials form a longitudinally convex elevation above the interradials, which give the short body a somewhat pentagonal appearance. Only three interradial plates appear in the figure, and, though I have examined several, otherwise, very good specimens, I have been unal)le to discover the outlines of more than three plates; but from these examinations, I am led to believe, that there are six interradial plates or minute pieces arranged about as in other species ofthis genus. Arms rise free from the third radial, cylindrical on the Fig. 20. Glyptocrinus Shafferi, magnified 23^ diameters. bifnrcate, in one specimen on the twelfth plate and in another specimen on the ninth plate; (the figure was made from the latter specimen, but by mistake only seven plates appear in each of two rays); and run to a point, from twenty to thirty pieces distant without another division. Each plate or arm piece supports, on a shoulder, on one of its inner lateral sides a comparatively large and strong pinnule. The pinnules are alternately arranged on the inner lateral sides of the arms and are composed of pieces three or four times as long as wide. Column large, compared with the size of the pelvis; composed, near the head, of alternately thicker and thinner pieces, but a short distance below the head, three, four or more thin plates intervene between the thicker ones, presenting the appearance of a string of little spools. This species is di>tinguished from others, by its small, smooth body, coarse pinnules, and free arms, above the third radial. The cup terminates with the third radial. The column is distinguished from any other in our rocks, by the distance between the larger plates, which gives it the appearance of a string of little spools. The range seems to be about the same as that of G. decadadylm, or between 300
Size: 1375px × 1817px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookcollecti, bookdecade1870, booksubjectscience