PLATE II. 



Fig. 1. Hcbcrtella occidcntalis, Hall. A, brachial valve. B, pedicel valve, 

 Type specimen illustrated in New York Paleontology, vol. 1, plate 

 32A, by figures 2c, 2k. Cincinnati, Ohio. 



Fig. 2. HeherteUa occidentalis, Hall. A, brachial valve; B, pedicel valve. 

 Type specimen illustrated in New York Paleontology, vol. 1, plate 

 32 A, by fig. 2e. Cincinnati, Ohio. 



Fig. 3. Cata^yga headi-schiichertana , Ulrich, lateral view. Madison, Indiana, 

 from the Waynesville bed, Madison, Indiana. 



Fig. 4. Rafinesquiua declivis, James. Pedicel valve, enlarged 1.8 diameters. 

 The type specimen described by James. Boyd's station, Kentucky, 

 from the argillaceous limestones beneath the Eden formation. 



Fig. 5. Hebertella sitntata, Hall. Brachial valve. Type specimen illustrated 

 in Nezu York Paleontology, vol. 1, plate 32 B, figs, d, h, k, and plate 

 32 C, fig. o. Cincinnati, Ohio. 



Fig. 6. Pasceoliis canidenensis. Camden, Ohio. 



Fig. 7. Calymenc platyeephala. Clifton, Tennessee, in the Saltillo bed. 



Fig. S. Hebertella siibjitgatO' Hall. Brachial valve. Type specimen illus- 

 trated in Nezu York Paleontology, vol. 1, plate 32 C, fig. la. Cin- 

 cinnati, Ohio. 



Fig. 9. Plectortltis jamesi, Hall. A, Brachial valve, enlarged; B, Pedicel 

 valve of the same specimen. Type specimen, illustrated in the 

 Uliio Paleontology, vol. 2, plate 1, by figs. 21, 22. Cincinnati, 

 Ohio. 



Fig. 10. Cyeloeoelia sordida. Hall. Brachial valve. Type. Cincinnati, Ohio. 

 Magnified 1.7 diameters. 



Fig. 11. Cyeloeoelia ella, Hall. Type, with 21 plications, belonging to series 

 No. 1506-3, in the American Museum of Natural History, in New 

 York City. Cincinnati, Ohio. Magnified 1.7 diameters. 



Fig. 12. Cyeloeoelia ella. Hall. One of the same series of types, numbered 

 1056-3, but with 27 plications, approaching Cyeloeoelia sordida- 

 mnltiplieata- Cincinnati, Ohio. Magnified 1.7 diameters. 



Fig. 13. Pleetorthis eqiiii'ak'is, Hall. A, Brachial valve; B, lateral view. Type, 

 in the American Museum of Natural History, in New York City. 

 Cincinnati, Ohio. 



Fig. 14. Calymene senaria, Conrad. American Museum of Natural History, 

 in New York City. From the Trenton, at Trenton Falls, New 

 York. 



Fig. 15. Zygospira inodesta. Hall. A, Brachial valve, enlarged; B, pedicel 

 valve, of the same specimen. Type. Cincinnati, Ohio. 



Fig. 16. Rhynehotrema dentata. Hall. Brachial valve. Type. From the re- 

 gion of the Cincinnati geanticline, possiblv from the Whitewater 

 bed. 



Fig. 17. Lingula modesfa, Ulrich. Frankfort, Kentucky, from the Logana bed. 



Fig. is. Lingula zcaynesboroensis. Three and a half miles northwest of 

 Waynesboro, Tennessee, near the home of W. D. Helton, on Beech 

 creek, in the Saltillo bed. 



Fig. 19. Cafacyga uphami-australis. A, brachial valve ; B, lateral view. High 

 Bridge, Kentucky, near the lower part of the exposures on the 

 road down to the lock, in the Camp-nelson division of the High- 

 bridge formation. 



Fig. 20. Leptobolus lepis-eliftonensis. A, pedicel valve ; B, cast of interior of 

 pedicel valve; C, cast of interior of brachial halve. Clifton, Ten- 

 nessee, from the Saltillo limestone. Magnified 5 diameters. 



Fig. 21. Conocardiuni riehmondensis. A, lateral view; B, cardinal view. Mag- 

 nified 1.6 diameters. Elkhorn creek, 15 feet below the Brassfiekl 

 or Clinton bed, in the Elkhorn bed. southeast of Richmond, Indiana. 



Fig. 22. Orthoeeras (Ormoeeras ?) hitzi. Vertical section passing oMiqucly 

 through the siphuncle, crossing the center near the lower end of the 

 specimen. The distinctness of the detail is over-accentuated in the 

 drawing. Madison. Indiana, from the Hitz layer, at the top of tlie 

 Saluda bed. 



Fig. 23. Cyrtoeeras hitzi. A, 'cross-section near the upper end, the concave 

 side of the specimen not being preserved; B, convex or dorsal side; 

 C, lateral view of the imperfect specimen. Madison, Indiana, from 

 the Hitz layer, at the top of the Saluda bed. 



Fig. 24. Orthoeeras (Loxoceras ?) inilleri. A, cross-section, showing relative 

 size of the siphuncle where passing through the septum; B. vertical 

 section through the siphuncle, showing strongly nummuloidal seg- 

 ments, as in Actinoceras. Two miles south of the Crow distillery,. 

 7 miles south of Frankfort, Kentuckv, from the Perrvville bed. 



