Explanation of Plate XVI 



Cybeloides iowensis sp. nov., page 64. 

 Fig. I. The holotype. Mus. No. P 16631. X S/ 4 . 



Figs. 2, 3. Dorsal and anterior views of the paratype. Mus. No. P 17039. X I. 

 Fig. 4. A detached free cheek showing form and position of the eye. Mus. 

 No. P 16633. X 5/ 4 . 



Encrinurus pernodosus sp. nov., page 61. 

 Figs. 5, 6. Dorsal and lateral views of the holotype. Mus. No. P 17038. 

 X3/ 2 . 



Fig. 7. A detached pygidium. Mus. No. P 16930. X I. 



Calymene fayettensis sp. nov., page 67. 



Figs. 8, 9. Dorsal and lateral views of the type specimen. Mus. No. P 16755. 

 X3/ 2 . 



