CRINOIDS. 211 



Barycrinus meekianus (Shumard). 



Poteriocrinus 7neekianus Shumard, 1856 : Geol. Sur. Missouri, Ann. Rep., 

 p. 188, pi. A, Jigs, 7a-b. 



Calyx similar to B. spurius. 



Horizon and localities. — Lower Carboniferous, Burlington 



limestone : Mount Vernon. 



Poteriocrinus brittsi Miller. 



Poteriocrinus brittsi Miller, 1891: Geol. Sur. Missouri, Bui. 4, p. 30, pi. 



iv, tigs. 5-6. 

 Poteriocrinus agnatus Miller, 1891 : Geol. Sur. Indiana, 17th Ann. Rep., 



adv. sheets, p. 43, pi. viii, figs. 6-7. 



Horizon and localities. — Lower Carboniferous, Keokuk 

 limestone : Boonville. 



Scaphiocrinus missouriensis ( Shumard). 



Plate xxvi, fig. 2. 

 Poteriocrinus longidactylus Shumard, 1855: Geol. Sur. Missouri, Ann. 



Rept., p. 188, pi. B, figs. 5a-c. 

 Poteriocrinus missouriensis Shumard, 1857 : Trans. Acad. Sci,, St. Louis, 



vol. I, p. 80. 

 Poteriocrinus missouriensis Hall, 1858: Geology lowa, vol. I, p. 669, pi. 



xvii, figs. 7a-b. 

 Poteriocrinus [Scaphiocrinus) -missouriensis Wacbsmuth & Springer, 1879: 



Proc. Acad. Nat. Sci., Phila. (Revision, p. 114.) 



Dorsal cup small, obconical ; infrabasals large, nearly equal- 

 ing the basals in size ; radials wider than high. Arms very 

 long, slender, bifurcating once, twice or even more times ; com- 

 posed of slightly wedge-shaped pieces. Ventral side very sim- 

 ilar to that of Poteriocrinus. Column circular in cross-section, 

 often slightly angular near the calyx. 



Horizon and localities. — Lower Carboniferous, Saint Louis 

 limestone : Saint Louis. 



Scaphiocrinus dactyliformis Hall. 



Scaphiocrinus dactyliformis Hall, 1858: Geology Iowa, vol. I, p. 670, pi. 

 xvii, fig. 6. 



As compared with D. missouriensis the calyx is much lower, 

 a,ngular, and with three arms to the ray. 



Horizon and localities. — Lower Carboniferous, Saint Louis 

 limestone : Saint Louis. 



