. The Devonian crinoids of the State of New York. Crinoidea, Fossil; Paleontology; Paleontology. 200 NEW YORK STATE MUSEUM The specimen upon which Hall based this species is only a fragment, but enough characters are shown to make it distinctive. A portion of the circumference of the body is preserved, and this indicates that the crown at the arms must have had a diameter of nearly three inches. Dorsal cup. Base of the dorsal cup unknown. Near the base of the arms a few of the small plates of the higher brachial series are indistinctly seen and some of the interaxillary plates between the arm
. The Devonian crinoids of the State of New York. Crinoidea, Fossil; Paleontology; Paleontology. 200 NEW YORK STATE MUSEUM The specimen upon which Hall based this species is only a fragment, but enough characters are shown to make it distinctive. A portion of the circumference of the body is preserved, and this indicates that the crown at the arms must have had a diameter of nearly three inches. Dorsal cup. Base of the dorsal cup unknown. Near the base of the arms a few of the small plates of the higher brachial series are indistinctly seen and some of the interaxillary plates between the arm bases. Tegmen, from the portion preserved, appears to be composed of numerous small, irregularly hexagonal plates; slightly depressed just within the arms and from there slightly convex toward the center. This gives a nearly flat appearance to the tegmen. Arms proceed abruptly from the margin of the cup; the bases of eleven arms are preserved. Since the frag- ment is scarcely more than one-fourth the circumference, it can be inferred that the specimen had at least forty 40 4 arms. Arms biserial. Figure 45 Acacocrinus pentadactylus. Left posterior view of the type, natural size. HonZOtl and locality. From the For the enlargement of this specimen, see New Scotland beds, Schoharie, N. Y. plate 26, figure 1. Figure 46 Analysis of calyx of Acacocrinus Types. Holotype in the collection pentadactylus. (After Grabau, 1899). 0f the New York State Museum. Remarks. See discussion under Family batocrinidae W. & Sp. Subfamily PERIECHOCRININAE W. & Sp. Genus ACACOCRINUS W. & Sp. 1897 Acacocrinus pentadactylus (Grabau) n. comb. Plate 26, figure i; text figures 45, 46 1898 Habrocrinus pentadactylus (nom. nud.) Grabau. 16th Ann. Rep't N. Y. State Geol. (1896), p. 285 1899 Habrocrinus pentadactylus Grabau. Bui. Buff. Soc. Nat. Sci., v. 6, nos. 2, 3, 4, pp. 143, 144, fig. 25. Please note that these images are extracted from scanned page images that may have been digitally enha
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpaleont, bookyear1923
