44 



PROCEEDINGS OF THE NATIONAL MUSEUM 



vou 6S 



Fig. 



-POLYGNATHIDAE,. new family 



1-3. Genus Panderodella, new genus. 1, 2. Views of right and left plates 

 with cross section, of the genotype Panderodella truncata, new species^ 

 X 20. Base of Mississippian (Hardin sandstone), Mount Pleasant, 

 Tenn. 3. Lateral view of Panderodella suhcrassa, new species, X 20, 

 from the same horizon and locality. 



4,5. Genus Polygnathellus, new genus. The genotype Polyr/nathellus typi- 

 calis, new species, X 20. Upper Devonian (Rhinestreet shale of 

 Portage), Shaleton, N. Y. 



6,7. Genus Polygnathus (Hinde) Bryant, 1921. G. View of upper surface 

 of plate of Polygnathus pennatus Hinde, 1879, selected by Bryant as 

 the genotype. Upper Devonian (Genundewa limestone of Genesee), 

 Eighteen Mile Creek, N. Y. 7. Upper and side views of plate of 

 Polygnathus pennatulus new species, X 20, a similar species from the 

 base of Mississippian (Hardin sandstone), Mount Pleasant, Tenn. 

 8-10. Genus Ancyrodella, new genus. 8, 9. Upper and lower surfaces of the 

 genotype Ancyrodella nodosa, new species, X 20. Devonian (Rhine- 

 street), Shaleton, N. Y. 10. Upper surface of Ancyrodella hamatus, 

 new species, X 20, Hardin sandstone. Mount Pleasant, Tenn. 

 11, 12. Genus Pahnatolepis, new genus. Upper and lower surface of the geno- 

 type Palmatolcpis perlohata, new species. Hardin sandstone. Mount 

 Pleasant, Tenn. 



13. Genus Ctenognathus Pander, 185G. Views of the genotype Ctenog- 



nathus murchisonl Pander, 1856. Silurian. Island of Oesel. 



14. Genus Onathodus Pander, 1956. Pander's illustration of the genotype 



Gnathodus mosqucnsis Pander, 1956. Carboniferous of Russia. 15. 

 Side viev,' of a plate of Polygnathus from Hardin sandstone at Mount 

 Pleasant, Tenn., showing resemblance to Gnathodus. 



