552 



THE CEINOIDEA CAMERATA OF NORTH AMERICA. 



Keokuk group, beyond which no vestige of them has been seen. There are 

 about sixty American species, and perhaps twenty from Europe, where it 

 occurs also only in the Mountain Limestone. 





Qm 



'<{SHWf' 





Eg. 19. Aciinocrinus. 

 (Explanation of tte letters as in Tig. 12.) 



ACTINOCRINUS J. S Miller. 



(Restricted.) 



1821. J. S. MiLLEK; a History of tlie Crinoidea, p. 9i. 



184i. McCoT; Synops. Carb. Foss. Ireland, p. 181. 



1844. De Koninck ; Description Anim. Foss., p. 49. 



1853, De Kon. and Le Hon ; Recher. Crin. Terr. Carb. Belgique, p. 123. 



1855, F, RoEMER ; Letliwa Geogn. (Ausg. 3), Jalirg. XIS., p. 246. 



1857. PiCTET ; Traite de PaMont., Vol. IV., p. 323. 



1866. Meek and Wokthek ; Geol. Rep. Illinois, Vol. 11., p. 147. 



1873. Meek and "Worthen ; ibid., Vol, V,, p. 341. 



1878. ZiTTEL ; Handb. d. Palaiontologie, Vol. I., p. 369. 



1881. W. and Sp. ; Revision Pateocr,, Part II., p. 138 (Proceed. Acad, Nat. Sci. Phila,, p. 312). 



1889. S, A, Miller ; N. A. Geol. and Palaont., p. 216. 



Syn. Blairocriims S. A. Miller ; Adv. Sheets 17tb Rep. lud., p. 69. 



