ORIN01Dg<. 187 



Actinocrinus tenuisculptus McCubsnet. 



Actinocrinus ienuisculptus McChesney, 1859 : Deso. New Species Foss. 



Pate. Rocks Western States, p. 15. 

 Actinocrinus tenuisculptus McChesney, 1867: Trans. Chicago Acad. Sci., 



vol. I, pi. V, fig. 11. 

 Actinocrinus chloris Hall, 1861: Jour. Boston Soc. Nat. Hist , vol. VII, p. 



275. 



Calyx of medium size, bowl shaped ; sculpturing as in P. 

 ornatus ( Hall ), and St. sculptus ( Hall ). 



Ilorison and localities. — Lower Carboniferous, Lower Bur- 

 lington limestone : Columbia. 



Actinocrinus thalia Hall. 



AcUnoci-inus thalia Hall, 1861 : Desc. New Species Crlnoids, p. 13. 

 Actinocrinus nodosus Miller, 1891: Bui. Geol. Sur. Missouri, No. 4, p. 33, 



pl. V, fig. 7. 

 Actinocrinus erraticus Miller & Gurley, 1894: Bui. 3, Illinois State Mus. 



Nat. Hist., p. 14, pl. ii, figs. 2 and 3.' 



Calyx rather large, arms closely arranged around the per- 

 iphery. Surface highly ornamented by ridges passing from 

 the long central node of each plate to the centers of the adjoin- 

 ing plates. 



Horizon and localities. — Lower Carboniferous, Lower 

 Burlington limestone : Sedalia. 



Actinocrinus obesus ^f. nov. 



Plate xxiv, fig. 4. 



Calyx large, broadly subfusiform ; arms 20 in number, 

 closely arranged around the periphery. Plates of the dorsal 

 cup subspinous ; those of the ventral side rather small, very 

 numerous. 



Horizon and localities — Lower Carboniferous, Burlington 

 limestone : Hannibal. 



Actinocrinus coeiatus Hall. 



Actvnocrinus coelatus Hall, 1858: Geology Iowa, vol. I, p. 585, pl. x, 

 ftgs. 14a-b. 



Calyx similar to that of J-. proboscidialis, but much larger 



and heavier. 



