PLATE XXX. 



PAGE. 



Figs._l-4 Stricklandinia planus Foerste. 



1-3-4. Casts of pedicle valves. 



2. Cast of brachial valve. 



2. a. Reconstructed interior of the brachial valve. Collinsville, Alabama. 



Fig. 5. Spirifera ( Cyrtia ) rosteiaum Hall. 



5. Cast of pedicle valve and a line indicating its convexity. Collinsville, Alabama. 

 Fig. 6. Spirifera plicaTEI,i,a var. radiata Sowerby. 



6. Brachial valve. Cumberland Gap Tenn. 



Fig. 7. Cornuwtes distans Hall 532 



7. Collinsville, Alabama. 



Fig. 8. Cornulites serpularius var. CmnToni, Hall. 



8. Colliusville. Alabama. 



Fig. 9. Plectambonites transversalis, var. Alabamensis Foerste. 



9. Cast of psdicle valve, and a line indicating its convexity. Collinsville, Alabama. 

 Fig. 10-12. Euomphalus sinuatus? Hall. 



10. ' View of the spire conjecturally completed from the curvature of the fragment 

 found. 



11. An entirely conjec.tural figure of a side view based on the slight elevation of the 



spire indicated by the fragment found, but serving to indicate the actual posi- 

 tion of the sinus at a ; a is a view of the sinus, the position of which is indicated 

 in figs. 10 and 11. ' 



12. A view from the umbilical side of a part of the fragment found. Collinsville, 



Alabama. It is an Euomphalus but probably not E. sinuatus. 



Fig. 13. Plectambonites transversalis, var. prolongata Foerste 566 



13. Pedicle valve and a line indicating the convexity of the same. Wildwood station, 



Georgia. 



Fig. 14. Pleorotomaria labrosa var. occidens, Hall. 



14. Collinsville, Alabama. 



Fig 15. Cyclonema biux, Conrad 551 



15. Brown's Quarry, near New Carlisle, Ohio. 



Fig. 16. Conularia Niagarensis Hall 547 



16. Todd's Fork, Ohio. 



Figs. 17-18. PenTamErus Ovaus Hall. 



17. A finely preserved cast of a brachial valve. 



18. A cast of a pedicle valve. Collinsville, Alabama. 



Fig. 19. Pterinea. 



I 18. Collinsville, Alabama. 

 Fig. 20. Ill^Jnus, perhaps I. Ioxus Hall. 



20. Fragment of a glabella ; possible outlines indicated. Collinsville, Alabama. 



Fig. 21. IvOXOnema ( cf Holopella ) subulata ? Conrad 556 



21. The striae partly preserved on the last coil. Todd's Fork, Ohio. 



Fig. 22. Strophomena ( Amphistrophia ? ) paTEnta Hall 569 



22.' Fragment, brachial valve, its origiml outlines restored. Collinsville, Alabama. 



Figs. 23-24. Rhynchonelia Janea Billings, 

 23 a. Inner cast of a brachial valve. 



23. b. Inner cast of a pedicle valve. 



24. Side view of an inner cast. Collinsville, Alabama. 



Fig. 25. Orthoceras ( Cycloceras ) Nova-Carlislense Foerste 545 



25. A section of the siphon. Brown's Quarry near New Carlisle, Ohio. 



Fig. 26. Orthoceras (Kionoceras) Crawfordi Foerste 546 



26 A vertical section showing the si jhon. Soldiers' Home near Dayton, Ohio. 



