Revision of the New York Helderbergian crinoids / by Mignon Talbot.

  • Talbot, Mignon.
Date:
[1905]
Catalogue details

Licence: In copyright

Credit: Revision of the New York Helderbergian crinoids / by Mignon Talbot. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    double tlie number now visible; lienee in this one collection, there are undoubtedly more crinoids than in all other collec- tions from New York combined. The following species, listed by Hall from the Coeymans limestone at North Litchfield, have not been recognized in the Yale material : Mariacrinus paucidactylus (probably Melo- crinuspa chy dactyl us), M. ramosus, M.plumosus, Platycrinus parvus (probably Cordylocri/nus plumosus), P. ramidosus (seems to be restricted to the Cobleskill zone of the Manlius) and P. tentaculatus. This is not to be wondered at, however, as a slight change of position, horizontally or vertically, often reveals a different fauna; and as Hall’s collections represented gatherings not only from the quarries but also from the stone walls about the town of Litchfield, the fossils undoubtedly came from different horizons and localities. In the classification, nomenclature and terminology of the crinoids, Wachsmuth and Sm-inger have been followed and the reader is referred to their 'works, “ The North American Crinoidea Camerata and “ The Revision of the Palseocri- noidead’f Order, Inadunata Wachsmuth and Springer. Suborder, Fistulata, Wachsmuth and Springer. Family, Cyathocrinidce Roemer. Genus, Homocrinus Hall. Homocrinus scoparius Hall. Plate III, figure 3. Homocrinus scoparius Hall, Nat. Hist. N. Y., Pal., vol. iii, 1859, p. 102, pi. 1, figs. 1-9.—Wachsmuth and Springer, Rev. Palseocr., Pt. I. 1879, p. 79; Proc. Phila. Acad. Nat. Sci., vol. xxxi, 1880, p. 302.—Batlier, Kongl. Svenska Yet. Akad., Handl. xxv, 1893, p. 105. • In the collection of crinoids from Jerusalem Hill, N. Y., now in the Yale University Museum, there is a considerable number of slabs showing Homocrinus scoparius in abundance. These slabs vary in size from a few centimeters to over half a meter in length and the surfaces are virtually covered with these beautiful fossils. One slab, thirty centimeters long and twenty-three wide, has eighteen specimens, three of which are complete, that is, have the crown and the whole length of the column, including the distal end. Aside from these, there are four other stems and two (possibly three) specimens of Anoma- locystites cornutus on the same slab. On other slabs from the same horizon are Melocrinuspachydactylus, Anomalocystites cornutus, Protaster forbesi, and Palmanites sp. (f). Many * Memoirs of the Museum of Comparative Zoology at Harvard College, vols. xx and xxi, with Atlas, Cambridge, Massachusetts, May, 1897. ] Proceedings of the Philadelphia Academy of Natural Sciences, vols. xxxi, xxxiii, xxxvii and xxxviii.