124 REFERENCES TO THE PLATES. 
Fig. 11. Anterior view of the same specimen as Fig. 9. These figures were accidentally left out 
of their proper position among the Plates, and have been introduced in Plate II, which was drawn 
after all the others. 
Figs. 12-14. An inferior tooth of Trachodon mirabilis, 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 Foulkti, and 
were accidentally left out of their proper place. 
Figs. 15, 16. A caudal vertebra of an undetermined Saurian, from a Cretaceous formation of 
Nebraska, presented to the Academy 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, convex. 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 :— 
Length . . 5 2 F : . = 5 : 5 . . ° =, 10 
Breadth . . . . . 5 . . . . . . . ° - 15 
Height . 5 5 . . . . . . . . ° - 19 
Depth of Soncavityal in front . . ° . De eZ 
Width of spinal canal at the middle of ing braeen poneaects of the arch . . 2 
PAT fir: 
Figs. 1, 2. A dorsal vertebra of Macrosaurus levis, 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 Rogersit, from near Blackwoodtown, Camden County, 
New Jersey, one-third the diameter of the original. 
Figs. 5-11. Vertebre 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; , posterior. 
Figs. 7-11. Vertebre 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; @, anterior; p, posterior. 
Figs. 12-15. Vertebre of a Crocodile, from Timber Creek, 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 Hyposaurus Rogersii, the natural size. 
