ART. 12 CLASSIFICATION OF CONODONTS ULRICH AND BASSLER H 



denticles, six in number, cylindrical, entirely separated, rather short, 

 bluntly accuminate, are fairly strong and inclined in a similar de- 

 gree. The bar is thin and straight and makes a rectangular junc- 

 tion with the uncommonly thick downward projection of the main 

 cusp. 



Occui^ence. — Devonian (Rhinestreet) : Shaleton, N. Y. 



Holotype.—C^t. No. 11240, U.S.N.M. 



PKIONIODUS INUTILIS, new species 



Plate 1, fij?. 23 



Similar to P. proclinatus but tooth smaller, the denticles includ- 

 ing the main cusp rather widely separated and few in number and 

 all more slender and less inclined forward. Downward projection 

 is relatively longer. 



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



Holotype.—Ciit. No. 11241, U.S.N.M. 



PRIONIODUS ALATUS Hinde. 1879 



Plate 1, figs. 2.5, 26 



1879. Prioniodusf alaius Hinde, Quart. Journ. Geol. Soc. London, vol. 35, p. 

 361, pi. 16, fig. 5. 



In this species the terminal main cusp is enormously developed 

 both in its upward and downAvard extension, the bar is of moderate 

 strength and in length about a fourth shorter than the combined 

 length of the main cusp and basal projection. The lateral denticles 

 are subequal, about 12 in number, confluent about one-half to three- 

 fourths of their length as though in a sheath with bluntly acumi- 

 nated terminations beyond it. They decrease quite regularly in 

 length in the posterior half of the bar, the longest having a total 

 length varying between a third and a half of the main cusp. Sides 

 of main cusp are rather sharply ridged, its edges acute and the 

 whole tooth has a somewhat flattened aspect in lateral view. The 

 inclination of the main cusp is constant with respect to the bar and 

 its upward extension varies somewhat in the width of its base as 

 shown in our two views. In those in which the cusp is widest, the 

 sheath also seems to be better developed particularly in its height. 



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



Plesiotypes. —C'At. No. 11242, U.S.N.M. 



PRIONIODUS CUUVIDENS, new species 



Plate 1, figs. 16, 17 



Main cusp and all the denticles curve slightly toward the front. 

 Main cusj) very long, sharp edged and angulated on the side so as to 



