22 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 08 



branous connection with the denticle behind it. Usually five short, 

 broad, confluent denticles, with spear-like terminations posterior to 

 the main cusp and four less confluent and more elongate conical 

 denticles on the anterior side. Downward projection of bar below 

 main cusp well developed. Of the posterior denticles, the second 

 and third from the main cusp are wider than the others, the last two 

 being quite small. 



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



(Jotype.—Q^i. No. 11258, U.S.N.M. 



BRYANTODUS? TRIDENTATUS, new species 



Plate C, fig. i;J 



Easily recognized in that the tooth consists of three broad based, 

 thin edged denticles gradually increasing in size to the largest which 

 is regarded as the main cusp and by the complete absence of the 

 bar and denticles posterior to this. There is no indication that 

 the absence of the posterior part is due to imperfection of the speci- 

 men. The species is only provisionally referred here pending the 

 discovery of other forms of similar nature. 



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



Holotype.—C^t. No. 11259, U.S.N.M. 



BRYANTODUS? INEQUALIS. new species 



Plate 6, fig. 14 



Readily distinguished by the extreme difference between the size 

 of the lateral series of denticles and the main cusp. The lateral 

 series of denticles are all fused but those on the shorter (anterior?) 

 .side five in number merging into the base of the main cusp, are much 

 snuiller and seem almost a part of it while seven making the longer 

 series are more definitely separated althougli also with confluent 

 edges. 



This species seems to be an aberrant type with possible proplietic 

 relations to the Mississippian genus PalmntodeUa. 



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



Holotijpe.—Cfii. No. 11260, U.S.N.M. 



BRYANTODUS MULTIDENS, new species 



Plate r>, figs. 15, 16 



Our figures are of two teeth showing opposite srdes, the inner 

 (15) and the outer (IG), and illustrate differences to be noticed in 

 such views. The tooth is longer with respect to the height than in 

 any other species. The denticles are developed normally for this 



