Explanation of Plate XV 

 Sphaerocoryphe maquoketensis sp. nov., page 77. 

 Figs. 1 , 2. Dorsal and lateral views of the holotype. Mus. No. P 1 1 152A. X 9 / '5- 

 Fig. 3. Dorsal view of pygidium from Elgin. Mus. No. P 16954. X 1. 

 Fig. 4. Ventral view of a larger pygidium from Elgin. Mus. No. P 17051. X 1. 



Amphilichas rhinoceros sp. nov., page 58. 

 Fig. 5. View of the inner surface of the shell of a cranidium. The type speci- 

 men. Mus. No. P 11181. X 6 /7- 



Fig. 6. Outline restoration from the type specimen. X ^/j. 



Amphilichas clermontensis sp. nov., page 59. 

 Fig. 7. Dorsal view of the type specimen. Mus. No. P 11257. X v7« 



