1-24 REFERENCES TO THE PLATES. 



Fig. 11. Anterior view of the same speciiiien as Fig. 9. These figures were accidentally left out 

 of their proper position among the Plates, and Lave been introduced in Plate II, which was drawn 

 after all the others. 



Figs. 12-14. An inferior tooth of Trachodon mii-abilis, trom the Bad Lands of the Judith River, 

 Upper Missouri, of the natural size. The fang is lost. 



Fig. 12. External view. 



Fig. 13. Lateral view. 



Fig. 14. Internal view. 



These figures are introduced for comparison with those of the teeth of Hadrosaurus Foulkii, and 

 were accidentally left out of their proper place. 



Figs. 15, 16. A caudal vertebra of an uudctcrniincd Saurian, from a Cretaceous formation of 

 !Nebraska, presented to the Academj' of Natural Sciences of Philadelphia by Dr. Hiram A. Prout. 

 The figures are of the natural size. Viewed from the extremities the specimen presents a somewhat 

 hexahedral outline. The vertical diameter of the body is greater than the transverse diameter, and 

 is nearly twice as great as its length. The sides are moderately constricted. The anterior surface, 

 as I suppose it to be, is concave, the posterior surface, in a corresponding degree, convey. From the 

 under part of the body project two short, robust processes, with an excavated articular facet for 

 junction with a chevron bone. The measurements of the specimen are as follows : — 



Lines. 



Length 10 



Breadth 15 



Height 19 



Depth of concavity in front 2 



Width of spinal canal at the middle of the broken abutments of the arch . . 2^ 



PLATE III. 



Figs. 1, 2. A dorsal vertebra of Macrosaurus loevis, from Monmouth County, New Jersey, one-half 

 the diameter of the original. 



Fig. 1. Lateral view; a, anterior; p, posterior. 



Fig. 2. Anterior view. 



Fig. 3. Tibia of an undetermined Reptile, from the Green-sand of Burlington County, New Jersey, 

 one-half the diameter of the original. 



Fig. 4. Fragment of a femur of Hyposaurus Mogersii, from near Blackwoodtown, Camden County, 

 New Jersey, one-third the diameter of the original. 



Figs. 5-11. Vertebra; of Thoracosaurus neocesariensis, one-half the diameter of the originals. 



Figs. 5, 6. Cervical vertebra, from Burlington County, New Jersey. 



Fig. 5. Inferior view. 



Fig. 6. Lateral view ; a, anterior ; p, posterior. 



Figs. T-11. Vertebra3 from Monmouth County, New Jersey, belonging to the collection of 

 Rutger's College. 



Fig. 7. The sixth cervical vertebra, right lateral view. 



Fig. 8. The third dorsal, right lateral view. 



Fig. 9. The eighth and ninth dorsals, coossified by a large exostosis, right lateral view. 



Fig. 10. The tenth dorsal vertebra, right lateral view. 



Fig. 11. The first lumbar vertebra, right lateral view ; a, anterior; p)< posterior. 



Figs. 12-15. Vertebra; of a Crocodile, from Timber Creeji, Gloucester County, New Jersey, one- 

 half the diameter of the originals. 



Fig. 12. A sixth cervical vertebra, right lateral view. 



Fig. 13. A fifth dorsal vertebra, right lateral view. 



Fig. 14. Sacrum, inferior view. 



Fig. 15. First caudal vertebra, inferior view. 



Figs. 16-21. Teeth of Hypmsaurus Rogersii, the natural size. 



