SYR. TAX.] 



ECHINODERMATA. 



285 



oweni, Hall, 1860, 13th Rep. N. Y. Mus. 



Nat. Hist., p. Ill, Waverly Gr. 

 papillatus, Hall, 1861, Desc. New Grin., 



p. 18, Burlington Gr. 

 robustus, Shumard, 1866, Trans. St. Louis 

 Acad. Sci., vol. 2, p. 397, and Geo. Sur. 

 111., vol. 6, p. 514, Keokuk Gr. 

 swallovi, Hall, 1858, Geo. Sur. Iowa, p. 



672, St. Louis Gr. 

 tennessfse, Troost. Not defined, 

 tennesseensis, Roemer, 1860, Sil. Fauna 



West Tenn., p. 55, Niagara Gr. 

 wnchsmuthi, seeCatillocrinus wachsmuthi. 

 wortheni, Hall, 1858, Geo. Sur. Iowa, p. 



560, Burlington Gr. 



SYRINGOCRINUS, Billings, 1859, Can. Org. 

 Reno., Decade 4, p. 65. [Ety. syrinx, 

 pipe ; krinon, lily.] Founded, possibly, 

 on the fragment of a ventral sac ; at 

 all events, not a well-characterized 

 genus. Type S. paradoxicus. 

 paradoxicus, Billings, 1859, Can. Org. Rem., 



Decade 4, p. 65, Trenton Gr. 

 TJENIASTER, Billings, 1858, Can. Org. Rem., 

 Decade 3, p. 80. [Ety. tainia, ribbon; 

 aster, star.] No disk or marginal plates; 

 rays long, flexible, spinous ; adambu- 

 lacral plates elongated ; two rows of 

 ambulacral pores ; ossicles contracted in 

 the middle. Type T. spinosus. 



cylindricus, Bill- 

 in gs, 1857, 

 ( P a lae o c o m a 

 cyli ndrica, ) 

 Geo. Sur. Can., 

 p. 292, Trenton 

 Gr. 



elegans, S. A. 

 Miller, 1882, 

 Jour. Gin. Soc. 

 Nat. Hist., vol. 

 5, p. 41, Hud. 

 Riv. Gr. 



spinosus, Billings, 

 1857, (Pala>o- 

 coma spinosa, ) 

 Geo. Sur. Can., 

 p. 292, and Can. 

 Org. Rem., Decade 3, p. 80, Trenton Gr. 

 TALAROCRINUS, Wachsmuth & Springer, 

 1881, Proc. Acad. Nat. Sci. Puil., p. 

 259. [Ety. talaros, basket ; krinon, lily.] 

 Calyx sub-conical ; suture lines im- 

 pressed; distinguished from Dichocri- 

 nus by its higher vault and having the 

 opening through it and not at the end 

 of a tube, and in having the secondary 

 radials form part of the calyx. Type T. 

 cornigerus. 



cornigerus, Shumard, 1857, (Dichocrinus 

 cornigerus,) Trans. St. Louis Acad. 

 Sci., vol. 1, p. 72, Kaskaskia Gr. 

 elegans, Lyon & Casseday, 1860, (Dicho- 

 crinus elegans,) Proc. Am. Acad. Arts 

 and Sci., vol. 5, p. 22, St. Louis Gr. 

 ovatus, Worthen, 1882, Bull. No. 1, 111. 

 . St. Mus. Nat. Hist., p. 36, and Geo. Sur. 

 111., vol. 7, p. 314, Kaskaskia Gr. 



FIG. 439. Tseniaster 

 spinosus. 



sexlobatus, Shumard, 1857, (Dichocrinus 

 sexlobatus,) Trans. St. Louis Acad. Sci., 

 vol. 1, p. 73, Kaskaskia Gr. 

 symmetricus, Lyon & Caeseday, 1860, 

 (Dichocrinus symmetricus,) Proc. Am. 

 Acad. Arts and Sci., vol. 5, p. 22, Kas- 

 kaskia Gr. 



TAXOCRINUS, Phillips, 1843, Morris Cat. Brit. 

 FOBS., p. 90. [Ety. taxus, yew-tree; 

 krinon, lily.] Calyx short, cup-shaped ; 

 basals 3, small, unequal; subradials 5, 

 one larger than the others ; primary 

 radials 3 or 4 by 5; secondary radials 

 3 to six by 10 ; tertiary radials support- 

 ing arms ; interradials to 9 ; azygous 

 interradials 2 to 5 ; arms dividing once 

 or twice. Type T. egertoni. 

 communis, Hall, 1863, (Forbesocrinus 

 communis,) 17th Rep. N. Y. St. Mus. 

 Nat. Hist., p. 55, and Ohio Pal., vol. 2, 

 p. 169, Waverly Gr. 

 curtus, Williams, 1882, Proc. Acad. Nat. 



Sci. Phil., p. 30, Chemung Gr. 

 elegans, Billings, 1857, 

 (Lecanocrinus ele- 

 gans,) Geo. Sur. 

 Can., p. 278, and 

 Can. Org. Rem., 

 Decade 4, p. 47, 

 Trenton Gr. 

 fletcheri, Worthen, 

 1882, Bull. No. 1, 

 111. St. Mus. Nat. 

 Hist., p. 31, and 

 Geo. Sur. 111., vol. 

 7, p. 308, Keokuk 



Gr. FIG. 440. Taxocrinus 



giddingei, Hall, 1858, (?) elegans. 

 (Forbesocrinus giddingei,) Geo. Sur. 

 Iowa, p. 633, Keokuk Gr. 



g r a c i 1 is, 

 Meek & 

 Worthe n , 

 1865, Proc. 

 Acad. Nat. 

 Sci. Phil., 

 p. 142, and 

 Geo. Sur. 

 111., vol. 3, 

 p. 421, 

 Ham. Gr. 

 inter medi- 

 us, Wachs- 

 m u t h & 

 Springer, 

 (in press,) 

 Geo. Sur. 

 111., vol. S, p. 199, Kinderhook Gr. 

 interscapularis, Hall, 1858, Geo. Sur. Iowa, 



p. 482, Ham. Gr. 

 ithacensis, Williams, 1882, Proc. Acad. 



Nat. Sci. Phil., p. 28, Chemung Gr. 

 juvenis, Hall, 1861, (Forbesocrinus ju- 

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

 319, Burlington Gr. 



kelloggi, Hall, 1863, (Forbesocriuus kel- 

 loggi,) 17th Rep. N. Y. St. Mus. Nat. 

 Hist., p. 56, and Ohio Pal., vol. 2, p. 

 171, Waverly Gr. 



FIG. 441. Taxocrinus gracili 

 Diagram. 



