. A catalogue of the collection of Cambrian and Silurian fossils contained in the Geological Museum of the University of Cambridge. Paleontology; Paleontology. p. 56. FC FC. Dimerocrinus decadactylus, Phill. (Siluria, 2nd 13, fig. 5). Cup with convex highly ornamented plates. Ten arms which diverge. A common species. This grows large. A very fine specimen shews the arms and plates of the cup tuberculate. Periechocrinus, Austin. The largest and most common of Dudley crinoids, with a long conical cup—plated all the way up to the end of the bifurcation of the arms, which then, fifteen to t
. A catalogue of the collection of Cambrian and Silurian fossils contained in the Geological Museum of the University of Cambridge. Paleontology; Paleontology. p. 56. FC FC. Dimerocrinus decadactylus, Phill. (Siluria, 2nd 13, fig. 5). Cup with convex highly ornamented plates. Ten arms which diverge. A common species. This grows large. A very fine specimen shews the arms and plates of the cup tuberculate. Periechocrinus, Austin. The largest and most common of Dudley crinoids, with a long conical cup—plated all the way up to the end of the bifurcation of the arms, which then, fifteen to thirty-four in number, are long, straight and unbranched; but of course not simple, being composed of a double row of bones. Proboscis massive, central. Stomach plates small. Stems mo- niliform, of thick joints. Range—May Hill Sandstone to Ludlow rock. Periechocrinus moniliformis, Miller, spec. (Si- luria, 2nd ed. pi. 13, figs. 1, 2). There are thirty-two or thirty-four arms. Pelvis coni- cal, ridged by the radial plates. The arms branch and dichotomise. Periechocrinus simplex, n. s. Arms fifteen only. Cup smaller and broader, radials strongly ridged, plates radiated. A very distinct good species. Periechocrinus limonium, Arms twenty- seven or twenty-eight, as in moniliformis, but cup ovate. Scarcely ridged by the radial lines. Plates thin, looks like Hijpan- ilwcrinus granulosus. a. 406, Dudley, F. C. a. 407, Dudley, F. C. a. 408, stem, a. 409, cup dissected, a. 410, arms all displayed, Dudley, F. C.; a. 411, proboscis (Ketley Coll.); a. 412, proboscis (Ketley Coll.); a. 417, Dudley, F. C; a. 418, shews large pair of arms five - branched (Ketley Coll.). a. 413, Dudley, a. 414, Dudley, ; a. 415, shews the stomach- plates; a. 416, young, Dud- ley, F. C. 16. 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 orig
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