PLATE XIX. 



PAGE 



Figs. 1-4. Pi^uRoccELus ALTUS Marsh 200 



1. Metatarsal. X %. Near Muirkirk. (5687 U. S. N. M.) 



2. Middle caudal vertebra, front view. X Vs- Near Muirkirk. (5626 



U. S. N. M.) 



3. Same, side view. 



4. Outer and side view of tooth. Natural size. Near Muirkirk. 



(3333 G. C.) (After Marsh.) 



Fig. 5. AsTRODON JOHNSTONi Leidy. Outer, side, and inner views of tooth. 



Natural size. Bladensburg. (798 Yale Mus.) (After Marsh.) . 202 



Figs. 6, 7. Dryosaukus grandis Lull 204 



6. Astragalus, front view. X %. Near Muirkirk. (5652 U. S. N. M.) 



7. Metatarsals, front view. X V2. Near Muirkirk. (5684, 5704 U. S. 



N. M.) . 



518 



