ART. 12 CI^SSIFICATION OF CONODONTS ULBICH AND BASSLEU 27 



BRYANTODUS MINUTUS, new species 



Plate 10. fig. 6 



Characterized by the relatively very large size of the shai-p edged 

 main cusp and inconspicuous development of the denticles on llie 

 two sides of the base. On the thicker end of the bar there are tlu-ee 

 more or less confluent denticles, likewise three but more or less sepa- 

 rated ones on the smaller end. The chief characteristic of this species 

 besides its minule size, is the great disparity in the size of the 

 denticles and the main cusp. 



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

 Tenn. 



HoloUjpe.—Q2Lt. No. 11018, U.S.N.M. 



BRYANTODUS CRASSUS. new species 

 Plate 10. fig. 14 



Founded on a broken tootli which differs from others in the greater 

 strength of its bar with a distinct Ivnob beneath the median cusp 

 which latter is larger and peculiarly directed. The lateral denticles 

 are rather small. 



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

 Tenn. 



Holotype.—C^it. No. 11026, U.S.N.M. 



BRYANTODUS GRACILIS, new sprc-es 



Plate 10, fig. ]() 



Similar to B. suhradkdus but tooth on the whole more slender, 

 denticles smaller and more numerous and main cusp relatively much 

 thicker and probably longer, 



(9c'6"Mrrence.— Mississippian (Hardin sandstone) : Mount l^leasant, 

 Tenn. 



IIolotype.—Qsit. No. 11021, U.S.N.M. 



BRYANTODUS PERGRACILIS, nev/ species 

 Plate 10, fig. 11 



ISIore slender than B. (jracUh.^ whole tooth straighter and lateral 

 denticles more uniform in size at the two ends of bar. 



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

 Tenn. 



Holotype.—Csit. No. 11023, U.S.N.M. 



BRYANTODUS INCERTUS, new species 



Plate 10. fig. 8 



Founded upon tlie inner side of a nearly complete tooth distin- 

 guished from all others of this genus by its broadly curved form 



