302 PROCEEDINGS OF THE AMERICAN ACADEMY 



Kentucky, A^ol. 3, p. 472, PL 3, fig. 1, a-k. Suhcarhon- 

 iferous. 

 P. cORONARius. A. coronarius.) Lj'on, 1. c. p. 476, PI. 1, fig. 1, 1 a. 

 Suhcarhonifero us. 



PYGORYNCHUS, Agassiz, 1839. 



P. GouLDi, Bouv^, Proc. Bost. Soc. Nat. Hist., Dec, 1846, p. 192. 

 Its position (Millstone Grit) as given by M. Bouve is, we 

 think, exceedingly doubtful. 



RHODOCRINUS, Miller, 1821. 



R. WoRTHENi, Hall, Iowa, Vol. 1, p. 556, PI. 9, fig. 8, a- c. Suh- 

 carboniferous. Burlington limestone. 



SACCOCRINUS, Hall, 1852. 



S. SPECiosus, Hall, Palceont. N. York, Yol. 2, p. 205, PI. 46, fig. 

 1, a -n, fig. 2. Silurian. Niagara group. 



SCAPIHOCRINUS, Hall, 1858, Iowa, Vol. 1, p. 549. 



S. DACTTLiFORMis, Hall, lowa. Vol. 1, p. 670, PI. 17, fig. 6. Suh- 

 carboniferous. St. Louis limestone. 



S. DECABRACHiATus, Hall, lowa, Vol. 1, p. 679, PI. 25, fig. 1. 

 Subcarhoniferous. Kaskaskia limestone. 



S. DiCHOTOMUS, Hall, Iowa, Vol. 1, p. 553, diagram. Subcarbon- 

 iferous. Burlington limestone. 



S. iNTERNODius, Hall, lowa. Vol. 1, p. 679, PI. 25, fig. 2. Sub- 

 carboniferous. Kaskaskia limestone. 



S. SCOPARIUS, Hall, loAva, Vol. 1, p. 680, PI. 25, fig. 3, a, b. Sub- 

 carboniferous. Kaskaskia limestone. 



S. SIMPLEX, Hall, Iowa, Vol. 1, p. 551, PI. 9, fig. 10. Subcarbon- 

 iferous. Burlington limestone. 



SCHIZOCRINUS, Hall, 1847. 



S. NODOSus, Hall, Pateont. N. York, Vol. 1, p. 81, PI. 27, fig. 1, 



a-h; Foster and Whitney, Lake Superior, p. 208, PI. 25, 



fig. 2, a — c. Silurian. Trenton limestone. 

 S. STRiATUs, Hall, PalcTont. N. York, Vol. 1, p. 316, PI. 28, fig. 4, 



a — c. Silui'ian. Trenton limestone. 

 S. sp. indet.. Hall, 1. c. p. 86, PI. 29, fig. 1. Silurian. Trenton 



limestone. 



