194 CRINOIDS. 



Bloomfleld, Missouri, is manifestly identical with 8. Begalis, as 

 subsequent figures of testiferous specimens well show. 



Steganocrinus concinnus Shumajrd. 



Actinocrinus concinnus Shumard, 1855 : Geol. Sur. Missouri, 1st and 2nd 



Ann. Reps., p. 189, pi. A, fig. 5. 

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



p. 384. 

 Actinocrinus concinnus Meek & Worthen, 1866: Geol. Sur. Illinois, vol. II, 



p" 200, pi. XV, figs. 9a-b. 

 Sieganocrinus concinnus Wachsmuth & Springer, 1881: Proc. Acad. Nat. 



Sci , Phiia., p. 325. (Revision, p 151 ) 



Calyx much larger than in 8. araneolus, subglobose, but 

 becoming pentalobate at the bases of the radial appendages. 

 The sculpturing in the dorsal cup consists of a more or less 

 well-defined node at the centers of the ossicles, each of which 

 is connected with the nodes of the contiguous plates by a rather 

 prominent ridge ; within the triangular spaces thus formed are 

 from one to three smaller and less noticeable concentric ele- 

 vations. 



Horizon and localities. — Lower Carboniferous, Upper Bur- 

 lington limestone : Marion county, Springfield (Greene county) ; 

 Kinderhook (Illinois). 



Steganocrinus sculptus (Hall). 



Actinocrinus sculptus Hall, 1858 : Geology lowa, vol. I, p. 582, pi. x, figs. 



lla-b. 

 Steganocrinus sculptus Meek & Worthen, 1866: Geol. Sur. Illinois, vol. II, 



p. 198. 



Closely resembling 8. concinnus ^hni more lobate, and more 

 highly sculptured. 



Horizon and Zoc«Z^V^■e5.— Lower Carboniferous, Lower Bur- 

 lington limestone: White Ledge (Marion county). 



• Steganocrinus araneolus (Meek & Worthen). 



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



Phila., p. 387. 

 Steganocrinus araneolus Meek & Worthen, 1866 : Geol. Sur. Illinois, vol. II? 



p. 193, pi. XV, fig. la-b. 



Calyx very much broader than high, strongly pentalobate ; 

 dorsal cap nearly flat. Surface of the plates in the dorsal cup 



