ORINOIDS. 207 



Symbathocrinus swallovi Hall. 



Symbathocrinus swallovi Hall, 1858: Geology Iowa, vol. 1, p. 672, pi. xvii, 



figs. 8-9. 

 Syjnbathocrmua blairi Miller, 1891: Geol. Sur. Missouri, Bui. 4, p. 32, 



pi. iv, figs. 13-15. 



Like S. dentatus, but more angular in the back of the arms. 

 Ilorison and localities. — Lower Carboniferous, Keokuk 

 limestone: St. Louis county, Boonville ; Keokuk (Iowa). 



Belemnocrinus? sampsoni Miller. 



Plate XXV, lig. 9. 



Bdemnozrinus sampsoni Miller, 1890: Geol. Sur. Missouri, Bui. 4, p. 26, 

 pi. iii, fig. 8. 



Dorsal cup small, thrice as high as wide. Basals large, 

 very long and narrow. Eadials about two-thirds as high as 

 basals, subquadrangular. Arms two to the ray, with the bifur- 

 cation on the fourth brachial. Column of medium size, round. 



Horizon and localities. — Lower Carboniferous, Lower Bur- 

 lington limestone : Sedalia. 



Parisocrinus intennedius ( Hall). 



Cyathocrinus intermedius Hall, 1858: Geology lowa, vol. I, p. 627, pi. 



xviii, fig. 10. 

 PaHsocrmws i«;!ermerfiMS Wachstnuth & Springer, 1879 : Proc. Acad. Nat. 



Sci., Phila., (Revision, p. 115). 



This form unites the genera Cyathocrinus, with which it 

 agrees in arm structure and manner of articulation, and Pote- 

 riocrinus. 



Horizon and localities. — Lower Carboniferou-;, Keokuk 

 limestone : Warsaw ( Illinois ). 



Cyathocrinus iowensis Owen &Shumard. 

 Plate xvx, fig. 11. 



Cyathocrinus iowen&is Owen & Shumard, 1850 ; Jour. Acad. Nat. Sci., Phila. 

 (2), vol. II, p. 63. 



Cyathocrinus iowensis O"^ en & Shumard, 1852 : U. S. Geol. Sur. Wiscon- 

 sin, Iowa and Minnesota, p. 591, pi. 5 A, figs, lla-c. 



Cyathocrinus 7nalvaeeus Hall, 1S5S : Geol. Iowa, vol. I, p. 554, pi. ix, fig. 5. 



Cyathocrinus divaricatus Hall, 1861: Jour. Boston Soc. Nat. Hist., vol. 

 VII, p. 299. 



