38 PKOOEEDIIvrGS OF THE NATIONAL MUSEUM vol. 72 



Pl^TB 9 



All the specimens illustrated here and on plates 9 and 10 are from the 

 Chattanooga black shale of Lower Mississippian age at a locality 13 miles east 

 of north of Huntsville, Ala. All are magnified 12 diameters. 



Figs. 1, 2. Prioniodus alaJyamensis, new species. 



3. Prioniodus alatoides, new species. 



4. Prioniodus cultratus Ulrich and Bassler. 



5. Ligonodina parvula, new species. 



6, 7. Hindeodella tenerrima, new species. 



8. Hindeodella tninutidens, new species. 



9. Hindeodella germana, new species. 



10. 11. Hindeodella suMilis Ulrich and Bassler. 



12. Lonchodina irregularis, new species. 



13. Lonchodina discrete Ulrich and Bassler. 



14. Prioniodella arcuata, new species. 



15. Prioniodella inutilis, new species. 

 16, 17. Prioniodina separans, new species. 



18. Prioniodvna undulata, new species. 



Plate 10 



Chattanooga black shale 13 miles east of north of Huntsville, Ala. Magnified 

 12 diameters. 



J'iGS. 1, 2. Bryantodus inequalis, new species. 



3. Bryantodus inclinatus, new species. 



4. Bryantodus, species. 



5. Bryantodus germanus, new species. 



6. Bryantodus suhangulatus, new species. 



7. Euprioniodima germana, new species. 



8. Diplododella Mlateralis Ulrich and Bassler. 



9. HiMardella curvata, new species. 



10. Palmatodella delicatula Ulrich and Bassler. 



11. 12. Synprioniodina alternata Ulrich and Bassler. 



13. Synprioniodina plana, new si)ecies. 



14. Panderodella recta, new si)ecies. 



15. Panderodella sudrecta, new species. 



Plate 11 



Chattanooga black shale, 13 miles east of north of Huntsville, Ala. Magnifledi 

 12 diameters. 



Figs. 1, 2. Polygnathus gyratilineatus, new species. 



3. Polygnathus pergyratus, new species. 



4. Polygnathus trilobatus, new species. 



5-7. Polygnathus concentricus Ulrich and Bassler. 

 8-10. Palmatolepis inequalis, new species. 

 11, 12. Polygnathus rhomboideus Ulrich and Bassler. 



13. Palmatolepis elongatus, new species. 



14. Polygnathus pennatuloideus, new species. 



15. Polygnathus pennatvlus Ulrich and Bassler. 

 16-19. Palmatolepis perlobatus Ulrich and Bassler. 



o 



