PLATE XXXI. 



P^GE. 



Fig. 1. Strophomena ( Orthothetes ) Hanoverensis, Foerste 567 



Pedicle valve and a line indicating' its convexity. Hanover, Indiana. 



Fig. 2. Strophomena (amphistrophia) patenTa, Hall? 569 



Apparently a sickly form, brachial valve ; and a line indicating its convexity. 

 Hanover, Indiana. 



Fig. 3. BELLEROPHON (Bucania) exiguus, Foerste 548 



3. Side view. 



3a Lines indicating the character of a section transverse to Fig. 3. Hanover, Indiana. 



Figs. 4-5. Orthis calli gramma, Dayman var. dinorthis 572 



4. Cast of a pedicle valve. 



5. Cast of a brachial valve. Hanover, Indiana. 



Fig. 6. PlECTamboniTES TRANSVERSALIS, var. ELEGANTULA Hall 556 



Pedicle valve and a line indicating its convexity. Hanover, Indiana. 



Fig. 7. CyrtoliTES Youngi Foerste 549 



la A magnified side view with a line indicating the real size of the specimen. 

 7. Lines showing the outlines of a section vertical to Fig. la also magnified. Han- 

 over, Indiana. 



Fig. 8. ATRYPA MARGINALIS, var. MULTISTRIATA Foerste 591 



Pedicle valve. Hanover, Indiana. 

 Fig. 9. Atrypa marginalis, Dalman 591 



9. Pedicle valve. 



ito A brachial valve. Brown's Quarry, New Carlisle, Ohio. 



Figs. 10-11. CORNULITES DISTANS Hall 532 



10. Resembles a species of Tentaculites. 



11. Both in the cast and in the exterior views, is a figure of a true Cornulites. Cum- 



berland Gap, Tennessee. 



Fig. 12. Rhynchoneela neglecta Hall 592 



Pedicle valve. Hanover, Indiana 

 Fig. 13. Rhynchonella acinus var. convexa Foerste 593 



13a Brachial valve. 



V-\b Pedicle valve. 



13c Side view. Hanover Indiana. 



Fig. 14. Rhynchoneela acinus Hall 593 



From the Niagara of Waldron, Indiana, the most distinct form. 

 \Aa Brachial valve. 

 - \\b Pedicle valve. 

 14c Side view. 



Figs. 15-16. LepT.ena ( Rafinesouinia ) obscura, Hall ? 



15. Brachial valve and a line indicating its convexity. 



16. Pedicle valve and a line indicating its convexity Cumberland Gap. Tenne see. 



Fig. 17. Holopea OBSOLETA var. ELEYATA, Foerste. 



Cumberland Gap, Tennessee. 



Figs. 1 8-19. Leptoccelia ? hemispherica Sowerby. 



18. Pedicle valve, with a line indicating its convexity. 



19. Brachial valve with a line indicating its convexity. Cumberland Gap, Tennessee 



Figs. 20-21. Phacops trisulcatus Hall 529 



20. A glabella. 



11. A pygidium. Cumberland Gap, Tennessee. 



