ATiT. 12 rLAS.SlFl(^\T10N OF CON(tI)()NTS — ULIUClU AND 15AS.SLKU 11) 



PKIONIODELLA NORMALIS, new species 

 riate 4, fig.s. 1.1' 



The moderately curved bar, relatively strongly produced pos- 

 teriorly, bearing 12 or 13 denticles with the strongest in the posterior 

 half, from which point they diminish in strength although not 

 greatly in length to the anterior extremity, is characteristic of tliis 

 sjiecies. The denticles are compressed rounded, closely arranged, but 

 remain separated practically to their bases. 



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



Hclotype.—Q^X. No. 11254, U.S.N.M. 



PRIONIODELLA INAEQUALIS, new species 



Plate 4, figs. 2, 3 



General shape as in P. normcdis^ except that the posterior ex- 

 tremity terminates more bluntly and the denticles are flatter, co- 

 alesced, and very unequal and irregular in size. The anterior den- 

 ticles are shorter and those of the middle half have an average size 

 much greater both in width and height than those in the terminol 

 quarter. 



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



Cotyyes.--Q.2ii. No. 11255, U.S.N.M. 



PRIONIODELLA AEQUIDENS. new species 



Plate 4, figs. 6, 7 



Similar to P. nornialis but bar is more curved, apparently without 

 a distinct posterior projection, with numerous subequal and v-ny 

 closel}' approximated, largely confluent denticles. 



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



Holotype.—Csit. No. 1125G, U.S.N.M. 



PRIONIODELLA MULTIDENS, new species 



Plate 4, figs. 4, 5 



Based upon a very small tooth the bar of which is relatively wide, 

 the denticles very small, numerous (21 or 22) relatively very short 

 and of approximately the same size except that a few may be wider 

 although not otherwise distinguishable. Although very close to- 

 gether, the denticles seem to be sej^arated from each other. 



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



Holotype.—Cd^i. No. 11257, U.S.N.M. 



