38 PROCEEDINGS OF THE NATIONAL MUSEUM vol. G8 



HIBBARDELLA SUBEQUALIS. new species 

 Plate 3, figs. 6, 7 



Compared Avith H. angidata^ in this new species the main cusp is 

 relatively shorter, tapers throughout its length instead of being par- 

 allel sided, the bar is much thicker and the denticles on the whole 

 more numerous (7) and more slender, more closely spaced, and the 

 increase in size outwardW is more pronounced. The base is more 

 arcuate, and the angle of the two sides is somewhat wider. 



Occurrence. — Devonian (Rhinestreet) : Shaleton. X. Y. 



Cotypes.—Q^i. No. 11296. U.S.N.M. 



HIBBARDELLA MULXmENS, new species 

 Plate 3, figs. 8, 9 



In this species the angulation of the bar is less making a much 

 wider angle between the arms, each of which is longer and carries 

 nine relatively short denticles in all the specimens seen. The major 

 cusp is very long, slender, parallel sided and seems particularly 

 extended on account of the shortness of the lateral denticles. The 

 flange at the base of the main cusp on the convex side is more clearly 

 indicated than in other species. 



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



Cotypes.—C^t. No. 11297, U.S.N.M. 



HIBBARDELLA? CONFERTISSIMA, new species 



Plate 3, fig. 5 



Although apparently bilaterally symmetrical and consisting of a 

 larger central main cusp with smaller denticles on each side, in 

 which respect it agrees with Hibhardella, this species in the closeness 

 of the denticles and other features must be placed here doubtfully. 

 More specimens may show a closer relationship to such genera as 

 Euprioniodina., Synjnnoniodina., and Diplododella. The species is 

 so distinct from the associated forms that in spite of its doubtful 

 generic affiliations Ave believe it worthy of description. 



Occurrence. — Devonian (Rhinestreet) : Shaleton, Erie County, 

 N. Y. 



H olotype. —Cvii. No. 11298, U.S.N.M. 



HINDEODELLA, new genus 



Bar long and straight, bearing as many as ten small denticles 

 in front of the strong long main cusp and a long series of numerous 

 small slender denticles often alternating in size behind it, those of 

 each set approximately equal in size. 



Genotype. — Hindeodella subtilis, new species. 



Range. — Upper Devonian and Early Mississippian. 



