. Bulletin - United States National Museum. Science. 220 BULLETIN 88, UNITED STATES NATIONAL MUSEUM. T^NIASTER CYLINDRICUS (Billings). Plate 36, figs. 2, 3; text fig. 18. Palxocoma cylindrica Billings, Geol. Surv. Canada, Rep. Progresg for 1853- 1856, 1857, p. 292. Txniaster cylindricus Billings, Geol. Surv. Canada, Can. Org. Rem., dec. 3, 1858, p. 81, pi. 10, figs. 4a-4c.—Wright. Men. British Foss. Echinod., Oolitic, vol. 2, pt. 1 (Palseontogr. Soc. for 1861), 1862, p. 34.—Parks, Trans. Cana- dian Inst., vol. 8, 1908, p. 371. Tseniura cylindrica Gregory, Proc. Zool. Soc. London for 1896, 1897
. Bulletin - United States National Museum. Science. 220 BULLETIN 88, UNITED STATES NATIONAL MUSEUM. T^NIASTER CYLINDRICUS (Billings). Plate 36, figs. 2, 3; text fig. 18. Palxocoma cylindrica Billings, Geol. Surv. Canada, Rep. Progresg for 1853- 1856, 1857, p. 292. Txniaster cylindricus Billings, Geol. Surv. Canada, Can. Org. Rem., dec. 3, 1858, p. 81, pi. 10, figs. 4a-4c.—Wright. Men. British Foss. Echinod., Oolitic, vol. 2, pt. 1 (Palseontogr. Soc. for 1861), 1862, p. 34.—Parks, Trans. Cana- dian Inst., vol. 8, 1908, p. 371. Tseniura cylindrica Gregory, Proc. Zool. Soc. London for 1896, 1897, p. 1035. Lapworthura cylindrica Parks, Trans. Canadian Inst., vol. 8, 1908, p. 371. Original description.—"One inch and a half in diameter; rays five [very flexible], covered with spines, subcylindrical, regularly rounded on the upper side, flattened on the lower, about one line in width at base, and regularly tapering to an acute ; Formation and locality.—In the Tren- ton limestone at Ottawa, Canada. The Fig. of actinal rat-plates cotypes (1405a), along with a third OF TXNIASTER CYLINDRICUS BILLINGS, spccimcn (1405), arc in the Victoria a, ambulacral; ad, side plates. \. • i -»r /^ Memorial Museum at Ottawa. TXNIASTER SCHOHARLffi Ruedemann. Txniaster schoharix Ruedemann, Bull. N. Y. State Mas., No. 162, 1912, p. 88, pi. 3, fig. 1. Original description.—The holotype "is small, the arms about 15 mm. long, and it is wdthout a disk. The arms are slender and flexible, about mm. wide at the base, and almost as high in lateral view, originally probably cylindrical. The ventral view shows a straight or slightly zigzagged ambulacral canal, and on both sides of this squarish depressions surrounded by the ambulacral and adambulacral ossicles, the covering lower arm plates not being retained if they existed. The inner (ambulacral or vertebral) ossicles appear as narrow and outwardly curved ridges, the outer or adambulacral ossicles as ri
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