ART. 12 CLASSIFICATION OF CONODONTS ULRICH AND BASSLER 61 



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Fig. 14, 15. Hindcodella longidens, new species 40 



Two examples exhibiting the rather few but long ilenti- 

 clos. 



16. Hindeodella recta, new species 40 



Tooth .'showing similarity to H. longidens but denticles are 

 all shorter. 



17-19. Hindeodella suhtilis, new species 39 



Two teeth viewed from opposite .sides (17, 19) and another 

 specimen (18) believed to be a variation of the species. 



20. Hindeodella similis, new species 39 



Tooth with relationship to //. subtilis but denticles are of 

 uniform size. 



Plate 9 



The illustrations on this plate are magnified 15 diameters, and the speci- 

 mens are from the Hardin sandstone basal member ol the Mississippian- 

 (^liattanooga black shale at Mount Pleasant, Tenn. 



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Fig. 1. Frioniodiis parvidentatus, new species 9 



Tooth showing minute, closely arranged denticles. 



2,3. Frioniodus spicatulus, new species 9 



Right and left teeth with the widely separated minute 

 denticles. 



4. Prioniodus reversus, new species 10 



An imperfect specimen. 



5. Ligonodina tridcntata, new species 15 



View of tooth showing the peculiarities of this species. 



6. Prioniodus inequalis, new species 10 



Tooth with the characteristic unequal development of the 

 two parts of the main cusp. 



7. Prioniodus cultratus, new .species 9 



An imperfect tooth exhibiting the erect denticles. 



8-10. Prioniodus proclinis, new species 9 



Three teeth of whicli Figure 8 represents the holotype. 



11. Prioniodus concavus, new species 10 



Tooth exhibiting the well-developed concave base. 



12. Prioniodus disparilis, new species 10 



The type specimen with its very large and rounded terminal 

 cusp. 



13. lirijantodus curvatidus, new species 28 



Tootli, with the characteristic curved bar and compactly 

 aiTanged denticles. 



14. Panderodella subcrassa, new species 53 



View of plate showing the coarse denticles. 



15-17. Panderodella truncata, new species 52 



(15, lU) Right and left plates with cross section of one, and 

 (17) a longer example. 



IS- 20. Palmatolepis glaber, new species 51 



(18, 1!)) Side views of two plates and cross section, illus- 

 tiating the sliarply defined, broad base, and (20) side view 

 of another pUite. 



