OF ARTS AND SCIENCES. 303 



SCHYPHOCRTNUS, Hall, 1847. 



S. HETEROCOSTALis, Hall, Palreont. N. York, Vol. 1, p. 85, PI. 28, 

 fio;. 3, a - f. Silurian. Trenton limestone. 



STENASTER, Billings, 1858. Silurian. Lower Silurian. 



S. PULCHELLUS, Billings, Geol. Survey of Canada, Palajont., Dec. 



HI. p. 79, PL 10, fig. 2. Silurian. Trenton limestone. 

 S. Salteri, Billings, 1. c. p. 78, PI. 10, fig. 1, a, b. Silurian. 



Trenton limestone. 



STEPHANOCRINUS, Conrad, 1842. 



S. ANGULATUS, Conrad, Joui'n. Acad. Nat. Sci. Philad., Vol. 8, p. 

 279, PI. 15, fig. 18; Hall, Paleeont. N. York, Vol. 2, p. 

 212, PI. 48, fig. 1, a-m. Silurian. Niagara shale. Lock- 

 port. 



S. GEMM^FORMIS, Hall, 1. c. fig. 2, a - i. Silurian. Niagara group. 



SYNBATHOCRINUS, Phillips, 1836. 



S. DENTATUS, Owcn and Shumard, Journ. Acad. Nat. Sci. Philad., 



Vol. 2, 2d Series ; Idem, Geol. Sui'vey of Wisconsin, Iowa, 



and Minnesota, p. 597, PI. 5 B, fig. 7, a, b. Subcarbon- 



iferous. Burlington limestone. 

 S. MATUTiNUS, Hall, Iowa, Vol. 1, p. 483, PI. 1, fig. 2. Devonian 



Hamilton group. 

 S. SwALLOVi, Hall, Iowa, Vol. 1, p. 672, PI. 17, fig. 89. Subcar- 



honiferous. St. Louis limestone. 

 S. WoRTHENi, Hall, Iowa, Vol. 1, p. 560, PI. 9, fig. 9. Subcar- 



boniferous. Burlington limestone. 



SAXOCRINUS, Phillips, 1836. 



S. iNTERSCAPULARis, Hall, lowa, Vol. 1, p. 482, PI. 1, fig. 3. 

 Devonian. Hamilton group. 



T^NICASTER, Billings, 1858. 



T. CYLiNDRicus, Billings, Geol. Survey of Canada, Pala?ont., Dec. 

 HI. p. 81, PI. 10, fig. 4, a, b. Silurian. Trenton limestone. 



T. SPINOSUS, Billings, 1. c. PI. 10, fig. 3, a -d. PalcBOcoma spinosa, 

 BiUings, Geol. Survey of Canada, Rep. 1856, p. 292. Silu- 

 rian. Trenton limestone. 



