AUT. 12 CLASSIFICATION OF CONODONTS ULRICH AND BASSLER 23 



genus but those on the two- sides of the main cusp are bilaterally 

 much more equal in size and more numerous than in other species, 

 there being at least ten on each side. The main cusp is very broad 

 and the membrane-like connection with the contiguous denticles is 

 mainly shown in the outer side. Further the main cusp is shorter 

 and projects less beyond the tips of the lateral denticles than in any 

 of the other species. 



Occurrence. — Devonian (Rhinestreet) : Shaleton, N. Y. 



Cotypes.—C2it. No. 11261, U.S.N.M. 



BRYANTODUS CRASSmENS, new species 

 Plate 6, figs. 17, 18 



Similar to B. typicus but differs in its more regular curvature 

 and more uniform development of the denticles, giving them a neater 

 aspect on the whole. The basal part of the main cusp is thicker on 

 both sides but especially on the inner side where the membranelike 

 connection with the adjacent denticles is much less evident. The 

 species differs from most others in the great thiclaiess of the denticles 

 near the base and their relative shortness and their greater length 

 and also straighter extremities. The denticles are also fewer than 

 usual with seven or eight behind the main cusp gradually diminish- 

 ing posteriorily and usually four anteriorily increasing in front of it. 



Occurrence. — Devonian (Rhinestreet) : Shaleton, N. Y. 



Cotypes.—C^t. No. 112G3, U.S.N.M. 



BRYANTODUS OBUQUUS, new species 

 Plate 6, figs. 19-21 



Distinguished from B. crassldens in having somewhat longer 

 denticles more curved in an anterior direction and particularly in 

 that the ones in front of the main cusp decrease in size anteriorily 

 instead of the reverse. 



Occurrence. — Devonian (Rhinestreet) : Shaleton, N. Y. 



C otypes. —Cfit. No. 112G4, U.S.N.M. 



BRYANTODUS SINUATUS, new species 



Plate, 6, figs. 22-24 



Evidently a close ally of B. ohliquus from which it differs par- 

 ticularly in the straighter bar, more sinuate base and the decided 

 projection of the portion beneath the main cusp, the latter feature 

 causing the appearance of a shallow sinus on each side; also in the 

 narrower and more cylindrical section of the denticles with longer 

 and more acuminate terminations. The main cusp is also longer 

 than in that species and not so wide. Other difference may be noted 



