DESCRIPTION OP PLATE LXVI— Continued. 581 



Page. 

 Fig. 10. Straparollus utahensis 573 



a. Apical view of a small specimen; after Hall and Whitfield. 



b. Apical view of a larger, somewhat exfoliated specimen; after Hall and Whitfield. 



Waverly age, Dry Canyon, Utah. 

 e. Section through a specimen from Yellowstone National Park. 



Madison limestone, east side of Gallatin River, west of Electric Peak. 

 Fig. 11. Platyceras, form B 576 



a. Lateral view of a small example attached to an exfoliated base of Platycrinus 



symmetricus. 



b. Posterior view of same. 



c. Same seen from above. 



d. Side view of a larger specimen. 



Madison limestone, divide between Gallatin River and Panther Creek, Gallatin 

 Range. 

 Fig. 12. Platyceras, form D 575 



a. View of specimen resting on its base, as seen from above, enlarged. 



b. Side view of same. 



c. Posterior view of same. 



Madison limestone, south base of Quadrant Mountain, Gallatin Range. 



Fig. 13. Naticopsis (?) sp -■ 572 



a. Internal cast of a specimen from the lower part of the Madison limestone. 

 Madison limestone, Crowfoot Ridge, Gallatin Range, top of bed 24. 



Fig. 14. Conocardium pulchellum ( ?) 571 



a. View of the only specimen found, enlarged. 



Madison limestone, Crowfoot Ridge, Gallatin Range, bed 21. 



