ART. 12 CLASSIFICATION OF CONODONTS ULEICH AND BASSLER 9 



often as long as the cusp itself, the anterior line formed by both being- 

 near ly straight. Numerous denticles on the bar, their lower half 

 or more sometimes fused, but in some cases, although always closely 

 arranged, they remain discrete to the junction with the bar. 



PRIONIODUS PARVIDENTATUS, new species 



Plate 9, flg. 1 



Terminal main cusp strongly inclined forward with similarly in- 

 clined closely approximated small denticles on the horizontal bar. 

 Downward extension similar in shape and size to terminal main 

 cusp. 



Occurrence. — Mississippian (Hardin sandstone) : Mount Pleasant, 

 Tenn. 



Holotype.—C^t. No. 11033, U.S.N.M. 



PRIONIODUS SPICATULUS, new species 



Plate 9, figs. 2, 3 



Differs from Prloniodus spicatus Hinde, 1879, of the Upper De- 

 vonian of western New York, in having the denticles on the horizon- 

 tal bar much shorter and apparently of uniform size instead of more 

 or less alternating long and short. 



Occurrence. — Mississippian (Hardin sandstone) : Mount Pleasant, 

 Tenn. 



Cotypes.—C2Li. No. 11035 U.S.N.M. 



PRIONIODUS CULTRATUS, new species 



Plate 9, fig. 7 



Distinguished by its flat, broad main cusp at right angles to the 

 bar, apparently short downward extension and denticles on bar of 

 uneven length with the larger near the main cusp and more inclined. 



Occurrence. — Mississippian (Hardin sandstone) : Mount Pleasant, 

 Tenn. 



Holotype.—Cdit. No. 11038, U.S.N.M. 



PRIONIODUS PROCLINIS, new species 



Plate 9, figs. 8-10 



Three doubtfully conspecific teeth provisionally referred to this 

 genus of which figure 8 is to be considered as the holotype of the 

 species. All of these are characterized by a rather short form, six 

 or eight rounded well-separated denticles of which the main or ter- 

 minal cusp is turned decidedly forward and the downward projection 

 is obsolete. 



Occurrence. — Mississippian (Hardin sandstone) : Mount Pleasant, 

 Tenn. 



Holotype and paratypes. — Cat. No. 11031, U.S.N.M. 

 6072S— 26 2 



