12 MEMOIR ON MOSASAURUS AND THREE ALLIED NEW GENERA. 



EEFEEENCE TO THE PLATES. 

 Plate I. 



The figures are all of the natural size. 



Fig. 1. Mosasaurus Hoffmani. 

 Figs. 2, 6. Mosasaurus Dekayi, Broiin. 

 Figs. 3, 4, 5. Mosasaurus minor, Gibbes. 

 Fig. 7. Mosasaurus Maximiliani, Goldfuss. 



Plate II. 



The figures are all of the natural size. 



Fig. 1. Upper surface of a fragment of the jaw of Mos. Caroliniensis. 

 Fig. 2. External lateral view of the same. 

 Fig. 3. Inner view of the same, inverted. 

 Figs. 4, 5. Mosasaurus Couperi, Gibbes. 



Plate III. 



Figures of the natural size. 



Figs. 1, 2, 3, 4, 5. Conosaiirus Botvmani, Gibbes. 

 Figs. 6,7,8,9,13. Holcodus acutidens, Gibbes; — striated and smooth 

 ' surfaces. 



Figures one fourth of the natural size. 



Figs. 10, 14. Convex articular surface of vertebrae of Amphorosteus. 

 Figs. 11, 15. Abdominal surface of vertebrse of the same. 

 Figs. 12, 16. Lateral views of the same. 



