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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1858 Excerpt: ...of a spiral disposition. Fig. 6. Body of a Briarean Pentacrinite and summit of its column, showing the interior of the ossicula that surround the abdominal cavity. E. Pelvis, f-First costal plate. From a specimen in the Oxford Museum. (Original.) Fig. 7. Fragment of a column in the collection of Mr. J. Sowerby, showing the oblique articulation of the base of the side arms, with the larger joints of the vertebral column. See Vol. I. p. 406, note. (Original.) Fig. 8. Magnified section of a portion of a column in the Oxford Museum. The joints, as in PI. 72, Figs. 4, 5, and in PI. 69, Figs. 3, 4, are alternately thicker and thinner; with a third and still thinner joint interposed between them. See Vol. I. p. 403, note. (Original.) Fig. 8 . Nat. size of Fig. 8. Fig. 8. Portion of a column, showing the manner in which the edges of the thinnest plates, c, are visible along the salient angles only. In the intermediate grooves the thicker plates of the first and second sizes, a, b, overlap and conceal the edges of the thinnest plates, c. The principle of this mechanism is the same as in Pentacrinites subangularis, PI. 72, Figs. 4, 5, and in Encrinites moniliformis, PI. 69, Figs. 3, 4; but the circular form of the column in the latter causes the smallest plate, c, to be visible around its entire circumference. See Vol. I. p. 403, note. (Original.) The bases of two side arms are seen in two of the grooves, articulating with the uppermost large joint of this column. On other large joints are seen the sockets from which similar side arms have fallen. Figs. 9, 10, 11, 12, 13. Various stellated forms on the articulating surfaces of vertebnc, preserved in the dislocated mass beneatli Figs. 1, 2. These petalshaped and crenated rays were probably adapted to produc...

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