134 REFERENCES TO THE PLATES. 



Fig. "T. The lower extremity. 



Figs. 8-11. Bones of the toes, found with the preceding fragments, one-half the diameter of the 

 originals. From the collection of Mr. Willis. 



Fig. 8. Lateral view of the fragment of a metatarsal bone. 



Figs. 9, 10. Upper view of two phalanges. 



Fig. 11. Lateral view of another phalanx. 



Figs. 12, 13. Mosasaurus. From the Yellowstone River, Nebraska. 



Fig. 12. Supposed ulna, one-half the diameter of the original. 



Fig. 13. Phalanx, the size of nature. 



PLATE XVIII. 



Figs. 1-3. Enujs beatus. From Gloucester Co., N. J. One-half the size of nature. 



Fig. 1. Plates of the carapace, a, First vertebral plate; b, c, third and fourth vertebral plates; 

 d, fragment of the first left costal plate ; e, g, portions of the second and third right costal plates. 



Fig. 2. Inner view of the second right costal fragment, exhibiting at / the rudiment of a costal 

 process. 



Fig. 3. First left marginal plate. The upper border of the figure is the outer or free margin of 

 the specimen. 



Figs. 4-8. Bolhremys Cookii. The size of nature. From Gloucester Co., N. J. Collection of 

 Prof. Cook. 



Fig. 4. Lateral view of the skull. 



Fig. 5. Lateral view of the mandible. 



Fig. 6. Upper view of the skull. 



Fig. t. Inferior view of the skull, a, Deep fuunel-.shaped pit of the maxilla. 



Fig. 8. Upper view of the mandible, b, Deep pit opposed to that of the upper jaw. 



Fig. 9. Outer portion of a left costal plate of Trionyx priscus, of the natural size. From Mon- 

 mouth County, N. J. Collection of Prof. Cook. 



Fig. 10. Portions of two marginal plates of Chelone ornala, of the natural size. From Burlington 

 County, N. J. The margin to the right is the free one. 



Figs 11-14. Teeth of Botlosauriis Harlani, of the natural size. From Burlington County, New 

 Jersey. 



Fig. 11. Outer view of a tooth. 



Fig. 12. Posterior view of the same. 



Fig. 13. Outer view of a large tooth, belonging to the Burlington County Lyceum of Natural 

 History. 



Fig. 14. Outer view of a small tooth. 



PLATE XIX. 



Fig. 1. Plates of the sternum of Emys pravus, one-third the diameter of the original. From 

 Tinton Falls, Monmouth County, New Jersey, and- belonging to the collection of the New Jersey 

 Geological Survey, a, Position of the entosternal bone ; b, the right hyosternal bone ; c, portion ol 

 the left hyposterual ; d, position of the right hyposternal ; c, f, fragments of both xiphisternals. 



Figs. 2, 3. Plates of the carapace and sternum of Emys firmuA, one-half the diameter of the 

 originals. From Tinton Falls, Monmouth County, New Jersey, and belonging also to the preceding 

 collection. 



Fig. 2. Greater portions of the sixth and seventh marginal plates of the left side, a. Sixth ; 

 /), seventh marginal plate. 



Fig. 3. Portions of the left hyosternal and right hyposternal plates, a. Position of the ento- 

 sternal ; b, left hyosternal, broken at its outer part; c, position of the right hyosternal ; d, portion 

 of the right hyposternal ; t", position of left hyposternal ; /, rj, position of xiphisternals. 



