184 CRINOIDS. 



Horizon and localities. — Lower Carboniferous, Keokuk 

 limestone: St. Francisville, Palmyra; Keokuk (lowal. 



Batocrinus planodiscus ( Hall ). 



Actinocrinus planodiscus Hall, 1860: Geol. Iowa, vol. I, Sapp.,p. 45. 

 Batocrinus planodiscus Meek & Worthen, 1873: Geol. Sur Illinois, vol. V, 



p. 367. 

 Batocrinus planodiscus Wachsmuth & Springer, 1878 : Proc. Acad. Nat. 



Sci., Phil a., p. 233. 



This species is very similar to B. trohiscun, but the calyx 

 is very much more flattened, and extended in the region of the 

 arm bases. 



Horizon and localities. — Lower Carboniferous, Keokuk 

 limestone : Keokuk and Bonaparte ( Iowa ). 



Batocrinus biturbinatus ( Hall ). 



Actinocrinus hiturbinatm Hall, 1858: Geol. lowa, vol. I, p. 616, pi. xvi, 



tigs. 5, 6a-e. 

 Batocrinus biturbinatus Meek & Worthen, 1873: Geol. Sur. Illinois, vol. V, 



p. 367. 



Calyx like in B. laura, but with much higher ventral side. 



Horizon and locality. — Lower Carboniferous, Keokuk 

 limestone : Boonville. 



Batocrinus pulchellus Miller. 



Batocrinus pulchellus Miller, 1891 : Geol. Sur. Indiana, 17th Ann. Rep., adv. 



sheets, p. 68, pi. xi, figs. 13-14. 



Calyx small, subglobular, with slightly convex plates. 



Horizon and locality. — Lower Carboniferous, Keokuk lime- 

 stone : Boonville. 



Batocrinus euconus (Meek & Worthen). 



Actinocrinus euconus Meek & Worthen, 1860: Proc. Acad. Nat. Sci., Phila., 



1860, p. 164. 

 Batocrinus euconus WachBxxiM.i'h. & Springer, 1881: Proc. Soc. Nat. Sci., 



Phila., vol. XXXIII, p. 340. 

 Batocrinus venustus Miller, 1891 : Geol. Sur. Indiana, 17th Ann. Rep., adv. 



sheets, p. 67, pi. xi, figs. 11-12. 

 Batocrinus divalis Miller, 1892: Geol. Sur. Indiana, 18th Ann. Rep., adv. 

 sheets, p. 22, pi. iii, figs. 6-7. 



Calyx subconic, ventral side elevated, dorsal cup low. 

 Surface smooth. 



Horizon and locality. — Lower Carboniferous, Keokuk 

 limestone : Boonville. 



