ART. 12 CLASSIFICATION OF CONODONTS ULRICH AND BASSLER 



Occurrence. — Mississippian (Hardin sandstone basal member of 

 the Chattanooga shale) ; Mount Pleasant, Tenn. 

 Holoty^e.—Q^i. No. 10982, U.S.N.M. 



Fig. 2. — DISTACODIDAE, new family 



1. 2. Genus Distcicodiis Hinde, 1879 {Maclialrodus Pander, 1S58. Preoccupied, 

 Machairodia Smith, 1907). (1) Lateral and basal views of Distacodus 

 {3Iachairodus) incurvus Pander, 1856, selected by S. A. Miller as 

 genot.vpe. (2) Lateral view of Distacodus {Machairodus) rhomhoideus 

 Pander, 1856. Both from Lower Ordovician of Baltic Provinces. 



3. Genus Acodus Pander, 1856. Opposite sides of tooth of genotype (first 



species) Acodus erectus Pander, 1856, and a transverse section of 

 Acodus acutus Pander, 1856. Lower Ordovician of Baltic Provinces. 



4. Genus Acontiodus Pander, 1856. Three views and transverse section 



of the genotype (first species) Acontiodus latus Pander, 1856. Lower 

 Ordovician of Baltic Provinces. 

 5,6. Genus Drepanodus Pander, 1856. (5) Opposite sides of tooth of 

 Drepauodus inflexus Pander, 1856, and a transverse section of Dre- 

 panodus flcxuosufi Pander, 1856. (6) Views of J)rcpanodus arcualus 

 Pander, 1856. Lower Ordovician of Baltic Provinces. 



7. Genus Scolopodus Pander, 1856. Views and cross section of the geno- 



type (first species) Scolopodus suMaevis Pander, 1856. Lower Orodo- 

 vician, Baltic Provinces. 



8. Genus Oistodus Pander, 1856. Lateral and transverse views of the geno- 



type (first species) Oistodus lanceolatus Pander, 1856. Lower Ordovi- 

 cian of Baltic Provinces. 



9. Genus Paltodus Pander. 1856. Three views and cross section of the geno- 



type (first species) Paltodus suhequalis Pander, 1856. Lower Ordovician 

 of Baltic I'rovincos. 



PRIONIODIDAE, new family 



Conodonts somewhat pick shaped in which the handle or bar 

 (posterior part) is denticulated and the anterior part consists of a 



