Explanation of Plate XXII. 



Fig. 1. Ptychocrinus splendens 162 



Specimen with arms. (After Miller.) 

 Silurian, Trenton limestone. 



Fig. 2. Rhodocrinus sp 7 



Side view. (Britt collection.) 

 Carboniferons, Kinderhook limestone. 



Fig. 3. Rhodocrinus coxanus . 163 



Type specimen. (Cox collection ) 

 Carboniferous, Keokuk limestone. 



Fig. 4. Amphoracrinus divergens 166 



Lateral view of calyx. (Keyes collection.) 

 Carboniferous, Lower Burlington limestone. 



Fig. 5 Megistocrinus brevicornis 165 



5a. Lateral view. (Keyes collection.) 

 5b. Top view of same. 



Carboniferous, Lower Burlington limestone. 



Fig. 6 . Megistocrinus evansi 164 



Lateral aspect of an average example. (Keyes collection.) 

 Carboniferous, Burlington limestone. 



Fig 7 Agaricocrinus planoconvexus 167 



7a. Side view. (M;u3 Mo. Geol. Sur.) 

 7b. • Dorsal aspect of same. 



Carboniferous, Lower Burlington limestone. 



Fig 8 Agaricocrinus america7ivs 168 



8a. Dorsal view of calyx. (Keyes collection.) 

 8b. Posterior view of same. 



Carboniferous, Keokuk limestone. 



Fig 9. Agaricocrinus pentagonus 167 



Specimen with arms. (Keyes collection.) 

 Carboniferous, Burlington limestone. 



