PLATE IX. 



PAGE. 



Figs. 1-3. Zaphrentis Cuffordana Ed. and Haime 465 



1. View ot an imperfect specimen showing the interior of the cup. 



2. Lateral view of another and smaller specimen. 



3. Enlarged transverse section of a specimen just below the bottom of the cup. 



Fig. 4. PENTRE MITES ELEGANS Lyon 466 



4. Latera4 view of a specimen from Newtonville, Ohio 



Figs. 5-8. Cyathocrinus Maxvii,i,ensis Whitf. 465 



5i "View of the anal side of a small specimen showing the long second radial plates 



and anal series, enlarged to two diameters. 

 G and 7. Anterior and posterior sides of another individual showing the thickened 



outer arm of the anterolateral ray and the small second radials of the anterior 



ray, natural size. 



8. Anterior view of a third specimen, natural size showing the thickened lateral anus. 



Figs. 9-10. Synocladia rectistyi,a Whitf. 467 



9. View of the inside of a frond, natural size, showing the straight rigid rays. 



10. Enlargement of a portion of the celluliferous surface showing the arrangements 

 of the cells. 



Figs. 11-12. Streptorhynchus crassum M. and W 468 



11 and 12. Impression of a ventral valve and a dorsal valve retaining the shell, the for- 

 mer showing the flattening of the umbonal area. 



Figs. 13-14.* Froductus piriformis McChesney 470 



13 and 14. Front and profile views of a specimen referred to this species. 



Figs. 15-16. Productus ELEGANS N. and P 469 



15 and 16. Two views of a specimen of this species of characteristic form. 



Figs. 17-18. Spirifera conTracta M. and W 471 



17. Dorsal view of the type specimen from the Chester limestone of Illinois, introduced 

 for comparison. 



18 and 19. Dorsal and profile views of a specimen from the Maxville^limestone, at New- 

 tonville, Ohio. 



Fig. 20. Spirifera Rockymontana (?) Marcou 471 



20. View of a ventral valve showing rather stronger plications than most individuals. 



Figs. 21-22. Terebratula Turgida Hall 473 



21 and 22. Dorsal and profile views of a specimen from Newtonville, Ohio. The figures 

 are slightly restored on the lower part. 



