NO. 2177. FOSSIL FISHES IN NATIONAL MUSEUM— EASTMAN. 299 



Fig. 4. Ctenacanthus gracillimus Newberry and Worthen, p. 261. 

 Spine, natural size. Mississippian (St. Louis limestone) ; near St. Louis, Mo. 



Figs. 5 and 6. Oracanthus triangularis, new species, p. 268. 



Spine, natural size. Part of spine? X §• Mississippian (St. Louis limestone): near 

 Alton, 111. 



Plate 6. 



Fig. 1. Edestus heinrichi Newberry and Worthen, p. 269. 



A large, well-preserved series of fused dental segments X i- 

 Pennsylvanian; Appanoose County, Iowa. 



Fig. 2. Oracanthus vetustus Leidy, p. 267. 

 Dorsal spine, X J- Mississippian (Kinderhook); Le Grande, Iowa. 



Plate 7. 



Harpacanthus procumbens, new species, p. 266. 



Fig. 1. Fin-spine, natural size. 



Mississippian (St. Louis limestone); St. Louis, Missouri. 



Erismacanthus maccoyanus St. John and Worthen, p. 265. 



Figs. 2, 3. Fin spines, natural size. 



Mississippian (St. Louis limestone); St. Louis, Missouri. 



Dicrenodus texanus, new species, p. 256. 



Fig. 4. Tooth, natural size. 



Pennsylvanian; near San Saba, Texas. 



Sauripterus taylori (?) Hall, p. 252. 



5. (?) Basisphenoid, natural size. 



Devonian (Catskill); near Blossburg, Pennsylvania. 



Coccosteus, species, p. 246. 



6. Antero-ventro-lateral plate, natural size. 



Devonian (Elbert formation); near San Juan, New Mexico. 



Ctenacanthus gracillimus Newberry and Worthen, p. 261. 



7. Fin-spines, natural size. 



Mississippian (St. Louis limestone); St. Louis, Missouri. 



Psammodus plenis St. John and Worthen, p. 258. 



8. A large-sized dental plate, natural size. 



Mississippian (St. Louis limestone); near St. Louis, Missouri. 



Plate 8. 



Polyrhizodus grandis, new species, p. 257. 



Figs. 1, 2. Dental plates, natural size. 



Mississippian (St. Louis limestone); near Alton, Illinois. 



