294 Shufeldt, Remains of Hesperornis. Ljuly 



other hand — and what appears to me to be more likely — the 

 discovery of additional material may conclusively prove that the 

 several individuals here considered were distinct species, which now, 

 at least, seems evident in the case of the one numbered 1499 in the 

 Yale Museum. 



Plate XVIII. 



[All the figures in the Plate are reduced to about three-fourths the actual 

 size of the specimens shown. R. W. S.] 



Fig. 3. Left lateral view of the cast of the 23d vertebra of Hesperornis 

 regalis. Belongs to a set in the collection of Yale University Museum. 

 Other views of this cast are given in Figs. 5, 7, 9 and 11. 



Fig. 4. Direct left lateral view of the vertebra of Hesperornis montana. 

 Other views of this fossil bone are given in Figs. 6, 8, 10 and 12. 



Fig. 5. Direct anterior view of the cast of the 23d vertebra of Hesper- 

 ornis regalis. Same specimen as Fig. 3 and others. 



Fig. 6. Direct anterior view of the 23d vertebra of Hesperornis mon- 

 tana. Same as shown in Fig. 4 and others. 



Fig. 7. Direct posterior view of the cast of the 23d vertebra of Hesper- 

 ornis regalis. Same specimen as Fig. 5 and others. 



Fig. 8. Direct posterior view of the 23d vertebra of Hesperornis 

 montana. Same fossil as shown in Fig. 6 and others. 



Fig. 9. Direct dorsal view of the cast of the 23d vertebra of Hesper- 

 ornis regalis. Same specimen as shown in Fig. 7 and others. 



Fig. 10. Direct dorsal view of the 23d vertebra of Hesperornis montana. 

 Same fossil as shown in Fig. 8 and others. 



Fig. 11. Direct ventral view of the cast of the 23d vertebra of Hesper- 

 ornis regalis. Same specimen as shown in Fig. 7 and others. 



Fig. 12. Direct ventral view of the 23d vertebra of Hesperornis mon- 

 tana. Same fossil as shown in Fig. 8 and others. 



