286 



ECHINODERMA TA. 



[TEC. TRH. 



lams, Billings, 1857, Geo. Sur. Can., p. 



278, and Can. Org. Rem., Decade 4, p. 



47, Trenton Gr. 

 lobatus, Hall, 1862, (Forbesocrinus loba- 



tus,) 15th Rep. N. Y. St. Mus. Nat. 



Hist., p. 124, Ham. Gr. 

 lobatus var. tardus, Hall, 1863, (Forbeso- 

 crinus lobatus var. tardus,) 17th Rep. 



N. Y. St. Mus. Nat. Hist., p. 56 



and Ohio Pal., vol. 2, p. 171, Wa- 



verly Gr. 

 meeki, Hall, 1858, (Forbesocrinus meeki,) 



Geo. Sur. Iowa, p. 631, Keokuk Gr. 

 multibrachiatus, Lyon & Casseday, 1858, 



(Forbesocrinus multibrachiatus,) Am. 



Jour. Sci. and Arts, vol. 28, p. 235, 



Keokuk Gr. 

 multibrachiatus var. colletti, White, 1881, 



2d Ann. Rep. Bureau of Statistics of 



Indiana, p. 506, Keokuk Gr. 



nuntius, Hall, 

 1862, (Forbeso- 

 crinus nun- 



tius,) 15th Rep. 

 N. Y. St. Mus. 



Fio. 442. Taxocrinus 

 robustus. 



Nat. Hist., p. 

 124, Ham Gr. 

 ramulosus, Hall, 

 1860, (Forbeso- 

 crinus ramulo- 

 sus,) Supp. 

 Geo. Sur. Iowa, 

 p. 67, Burling- 

 ton Gr. 



robustus, Wachs- 

 muth, (in 



press,) Geo. 

 Sur. 111., vol 8, 

 Kind e r h o o k 

 Gr. 



semiovatus, 

 Meek & Worthen, 1860, (Forbesocrinus 

 semiovatus,) Proc. Acad. Nat. Sci. Phil., 

 p. 389, and Geo. Sur. 111., vol. 2, p. 272, 

 St. Louis Gr. 



shumardanus, Hall, 1858, (Forbesocrinus j 

 shumardanus,) Geo. Sur. Iowa, p. 671, j 

 St. Louis Gr. 



thiemii, Hall, 1861, (Forbesocrinus ! 

 thiemii,) Desc. New Crin., p. 8, and 

 Geo. Sur. 111., vol. 5, p. 389, Burlington 

 Gr. 



whitfieldi, Hall, 1858, (Forbesocrinus 

 whitfieldi,) Geo. Sur. Iowa, p. 632, 

 Kaskaskia Gr. 



TKCHNOCRINUS, Hall, 1859, Pal. N. Y., vol. j 

 3, p. 139. [Ety. techne, art; krinon, \ 

 lily.] Basals 4, one larger than the \ 

 others; primary radials 3x5; second- 

 ary radials 1 x 10 ; tertiary radials 2 x 20 ; 

 interradials 3x5; arms simple, bearing 

 pinnules; column round. Type T. 

 andrewsi. 

 andrewsi. Hall, 1859. Pal. N. Y., vol. 3, p. 



141, Oriskany sandstone, 

 sculptus, Hall, 1859, Pal. N. Y., vol. 3, p. 



143, Oriskany sandstone, 

 spinulosus, Hall, 1859, Pal. N. Y., vol 3, p. 

 140, Oriskany sandstone. 



etriatus, Hall, 1859, Pal. N. Y., vol. 3, p. 



142, Oriskany sandstone. 

 TELEIOCRINUS, Wachsmuth & Springer, 1881, 

 Proc. Acad. Nat. Sci. Phil., p. 320. 

 [Ety. teleios, perfect ; kriron, lily.] Dis- 

 tinguished from Strotocrinus, with 

 which it has generally been classed, by 

 having a long ventral tube, instead of 

 a simple opening through the vault. 

 Type T. umbrosus. 



segilops, Hall, 1860, (Actinocrinus aegi- 

 lops,) Supp. to Geo. Sur. Iowa, p. 5, 

 Up. Burlington Gr. 



althea, Hall, 1861, (Actinocrinus althea,) 

 Desc. New Crin., p. 13, Up. Burling- 

 ton Gr. 



clivosus, Hall, 1861, (Actinocrinua clivo- 

 sus,) Bost. Jour. Nat. Hist., vol. 7, p. 

 274, Up. Burlington Gr. 



erodus, Hall, 1861, (Actinocrinus erodus,) 

 Desc. New Crin., p. 12, Up. Burling- 

 ton Gr. 



insculptus, Hall, 1861, (Actinocrinus in- 

 sculptus,) Desc. New Crin., p. 12, Up. 

 Burlington Gr. 



liratus, Hall, 1860, (Actinocrinus liratus,) 

 Supp. to Geo. Sur. Iowa, p. 1, and 

 Geo. Sur. 111., vol. 5, p. 355, Burling- 

 ton Gr. 



rudis, Hall, 1860, (Actinocrinus rudis,) 

 Supp. to Geo. Sur. Iowa, p. 33, Bur- 

 lington Gr. 



tenuiradiatus, Hall, 1861, (Actinocrinus 

 tenuiradiatus,) Desc. New Crin., p. 12, 

 Burlington Gr. 



umbrosus, Hall, 1858, (Actinocrinus um- 

 brosus,) Geo. Sur. Iowa, p. 590, Up. 

 Burlington Gr. 



THYSANOCRINUS, Hall, 1852, Pal. N. Y., vol. 

 2, p. 188. [Ety. thysanos, fringed; kri- 

 non, lily.] Calyx small, subglobose; 

 basals 5 ; subradials 5 ; primary radials 

 3x5;; secondary radials 2 or more 

 x 10 ; regular interradials 3 ; azygous 

 area wide, lower plates large, smaller 

 above ; arms composed of a double se- 

 ries of plates, with pinnules ; column 

 round. Type T. liliiformis. 



aculeatus, Hall, 1852, Pal. N. Y., vol. 2, p. 

 190, Niagara Gr. 



canaliculatus, Hall, 1852, Pal. N. Y., vol. 

 2, p. 189, Niagara Gr. 



immaturus, Hall, 1852, Pal. N. Y., vol. 2, 

 p. 191, Niagara Gr. 



liliiformis, Hall, 1852, Pal. N. Y., vol. 2, p. 

 188, Niagara Gr. 



microbasalis, see Archseocrinus micro- 

 basalis. 



pyriformis, see Archseocrinus pyriformis. 

 TREMATASTER, Worthen & Miller, 1883, Geo. 

 Sur. 111., vol. 7, p. 330. [Ety. trema, 

 opening ; aster, star.] Central part dis- 

 coid; rays long, flexuous, a double 

 series of ambulacral plates, with taper- 

 ing ends directed toward the apices of 

 the rays, upon each side of which there 

 is a series of curved adambulacral 

 plates, which form the margin of the 

 rays ; pores large between the con- 



