ART, 12 CLASSIFICATION OF CONODONTS ULEICH AND BASSLER 15 



offers a further perhaps more important difference in the fact 

 that the ridge along the anterior edge is reduced to a minimum. 



'I'his fine species is named in honor of Raymond R. Hibbard of 

 Buffalo, N. Y., in appreciation of his enthusiastic work upon the 

 conodonts and bryozoa. 



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



Cotypes.— Cat. No. 11251, U.S.N.M. 



LIGONODINA SIMPLEX, new species 



Plate 9, lig. 28 



The anterior end essentially as in other species of the genus except 

 that there are no denticles on the bar, only two suckei's on the down- 

 ward extension of the main cusp and the main cusp more recurved 

 than usual. 



Occurrence. — Mississippian (Hardin sandstone) : Mount Pleasant, 

 Tenn. 



Holotype.—C2it. No. 10983, U.S.N.M. 



LIGONODINA TRIDENTATA, new species 



Plate 9, fig. 5 



Based upon a peculiar apparently perfect tooth which may be 

 variously interpreted. It may consist of a long posteriorly fluted, 

 non-denticulated bar terminating anteriorly in a tridentate main 

 cusp with the denticulated portion entirely in front of the down- 

 ward projecting sucker bearing extension, or the denticulated por- 

 tion may be the bar and the long fluted extension may represent the 

 main cusp. 



Occurrence. — Mississippian (Hardin sandstone) : INIount Pleasant, 

 Tenn. 



Holotype.—QdX. No. 11029, U.S.N.M. 



PRIONIODINIDAE, new family 



Similar to the Prioniodidae but the base of tooth or bar is denti- 

 culated both forward and back, the main cusp thus being not termi- 

 nal but set in the midst of a series of smaller denticles. 



To tliis new family are referred Cornvramia., Valcnfia and Pachij- 

 somia Smith, 1907, Lonchodus and Prionognathus Pander, 1856, and 

 the following ten new genera : Prioniodina.., Euprloniodina., Lon- 

 chodina., Prioniodella^ Bryantodus^ Hibhardella^ Hindeodella^ Dip- 

 lododella., Palmatodella., and Synprioniodina. Lonchodus and Val- 

 entia are based upon fragments at present generically indetermin- 

 able, Prionognathns may not prove to be a conodont at all, Avhilo 

 nothing like C ornuraiiiln or Pachysomia has so far been recognized 

 in American strata. 



