rape. 

 EUOMPHALUS (Straparollus) Utahensis 259 



Fig. 20. View of the upper surface of a large individual f.om Ogden Canon, showing the obso- 

 lescence of the carina on the outer volution. 



21. View of a smaller individual from Dry Canon, as obtained by gutta-percha impression 



from the matrix. 



22. A similar small specimen from Logan Canon. The figure is an enlarged view. 



23. A view of the under side of a large specimen from near Read and Benton's mine, Utah. 



EueMPiiALus laxus 260 



Figs. 24-2r). Profile and vertical views of a specimen from Dry Canon, Utah. 



EuoMPHALUs (Straparollus) Ophirensis 261 



Fig. 26. Lateral view of the specimen, restored partly from the shell and partly from gutta- 

 percha impression in the matrix. 

 27. View of the umbilicus. From Dry Caiion, Ophir, Utah. 



Proetus peroccidens 262 



Fig. 28. View of a glabella of the species, from Dry Canon. 



29. View of the left movable cheek. 



30. View of a pygidium of large size, from the same locality. 



31-32. View of a smaller si)ecimen, natural size and enlarged, showing the ornamenta- 

 tion of the surface, from Ogden Canon, Utah. 



Proetus Loganensis 264 



Fig. 33. View of the pygidium, enlarged to two diameters, showing the specific features of this 

 part. 



