Klein — The Development of Agaricocrinus. 



181 



VII. 

 1861. Agaricocrinus gracilis, Meek and Worthen, 



VIII. 



U. Burlington. 



1860. 

 1882. 



1858. 

 1858. 

 1897. 



1855. 

 1858. 

 1858. 

 1860. 

 1861. 

 1869. 

 1881. 

 1881. 

 1890. 

 1890. 

 1890. 

 1891. 

 1891. 

 1891. 

 1895. 

 1895. 

 1895. 

 1897. 



1897. 

 1897. 



1897. 



Agaricocrinus Coreyi, Lyon and Casseday, 



Keokuk. 

 Agaricocrinus Springeri. 



IX. 



Agaricocrinus Wortheni, Hall. 

 Agaricocrinus Whiifieldi. 

 Agaricocrinus conicus. 



X. 



Keokuk. 



Keokuk. 

 Keokuk. 

 Keokuk. 



Agaricocrinus Americanus, Roemer. 

 Agaricocrinus tuberosus. 

 Agaricocrinus bulla tus. 

 Agaricocrinus pentagonus. 

 Agaricocrinus excavatus. 

 Agaricocrinus nodosus. 

 Agaricocrinus crassus ( ?) 

 Agaricocrinus elegans. 

 Aoaricocrinus Macadamsi. 

 Agaricocrinus nodulosus. 

 Agaricocrinus splendens . 

 Agaricocrinus dissimilis. 

 Agaricocrinus Gorbyi. 

 Agaricocrinus Indianensis 

 Agaricocrinus arcula. 

 Aga ricocrinu s profundus . 

 Agaricocrinus tugurium. 

 Agaricocrinus Americanus, var. tuberosus. 



Keokuk. 

 Agaricocrinus Iowensis. Keokuk. 



Agaricocrinus Keokukensis. Keokuk. 



Agaricocrinus nodulosus, var. Macadamsi. 



Keokuk. 



Keokuk. 



Keokuk. 



U. Burlington. 



U. Burlington. 



U. Burlington. 



U. Burlington. 



Keokuk. 



Keokuk. 



Keokuk. 



Keokuk. 



Keokuk. 



Keokuk. 



Keokuk. 



Keokuk. 



Keokuk. 



Keokuk. 



Keokuk. 



In conclusion I will offer a few suggestions as to the fea- 



oo 



tures which seem proper for specific separation. In the pre- 



