Talbot — New York Helderbergian Crinoids. 19 



double the number now visible ; hence 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 materia] : Mariacrinus paucidactylus (probably Melo- 

 crimispachydactylus), M. ramosus, M.plumosus, Platycrinus 

 jparvus (probably Cordyloerinus plumosus), P. ramulosus 

 (seems to be restricted to the Coblesldll 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 Sormger have been followed and the 

 reader is referred to their works, " The North American 

 Crinoidea Camerata "* and " The Revision of the Palaeocri- 

 noidea."f 



Order, Inadunata Wachsmuth and Springer. 



Suborder, Fistttlata, Wachsmuth and Springer. 

 Family, Cyathocrinidce Roemer. 

 Genus, Homocrinus Hall. 



Homocrinas 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, Kev. Palaeocr., Pt. I. 1879, p. 79; 

 Proc. Phila. Acad. Nat. Sci., vol. xxxi, 1880, p. 302.— Bather, Kongl. 

 Svenska Vet. Akad., Handl. xxv, 1893, p. 105. 



In the collection of crinoids from Jerusalem Hill, E". Y., 

 now in the Yale University Museum, there is a considerable 

 number of slabs showing Homoerimcs 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 eomutus on the same slab. On other slabs from the 

 same horizon are Meloerinus pachydaetylus, Anomalocystites 

 €0?mictus, Protaster forbesi, and Dalmanites sp. (f ). Many 



* Memoirs of the Museum of Comparative Zoology at Harvard College, 

 vols, xx and xxi, with Atlas, Cambridge, Massachusetts, May, 1897. 



•f Proceedings of the Philadelphia Academy of Natural Sciences, vols, xxxi, 

 xxxiii, xxxvii and xxxviii. 



