50 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 68 



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

 Tenn. 



Cotype.—Q2ii. No. 10995, U.S.N.M. 



PALMATOLEPIS BIFURCATA, new species 

 Plate 7, figs. 10, 17 



Lower and upper surface of two examples showing the distinct 

 and characteristic subequal bifurcation of the median crest. Upper 

 surface strongly tuberculated without definite arrangement; under 

 surface concentrically striated and ridged similar to the upper sur- 

 face. 



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

 Tenn. 



C oty pes. —C'Cii. No. 11010, U.S.N.M. 



PALMATOLEPIS ASYMMETRICA, new species 



Plate 7, fig. 18 



A member of the bifurcata group but readily distinguished by 

 the extreme divergence of the bifurcation, by the unsymmetrical 

 arrangement of its parts and the irregularly triangular outline. 



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

 Tenn. 



H oloty pe.—C^it. No. 11000, U.S.N.M. 



PALMATOLEPIS EXTRALOBATA. new species 



Plate 8, fig. 3 



Founded on a single specimen showing the under side. Similar 

 to P. yerlobata and possibly a variant of it but differing in the 

 presence of an extra fan-shaped lobe along the anterior side and 

 the sharp angle of divergence to the right of both branches of the 

 crest. 



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

 Tenn. 



H olotype.— C2ii. No. 11007, U.S.N.M. 



PALMATOLEPIS LOBATULA, new species 



Plate 7, figs. 3, 4 



Distinguished by the lobate outline, peculiarly curved crest bifur- 

 cating anteriorly, one of the branches running off at right angles 

 to the top of the lateral lobe and by the finely lineate ornament 

 present everywhere except on the denticulated summit of the poste- 

 rior half of the main crest. 



