List of Figures in Text. ix 



Mastodon aiiiericanus. Articular process of right styloid process . 465 



" " Inferior view of basi-hyal bone . . . 465 



" " Anterior view of hyoid bone . . . . 466 



" " Posterior view of hyoid bone. . . . 467 



View of the two rounded hills where the Agate Spring Fossil quarry is 



located 488 



Excavating in the Agate Spring Fossil (Quarry ..... 489 



Face of the Agate Spring Fossil Quarry ...... 490 



Cliff one mile north of Agate Spring Fossil quarry .... 492 



Exposed point in Niobrara Valley, one mile northwest of Agate S])ring 



Fossil Quarry .......... 493 



Diagram to show the relation of the sections on Valcour Island . . 526 



Diagram to show the range of the common species at Valcour Island . 528 



Diagram to show the relations of the various sections. . . . 570 



Dorsal view of the test of a specimen of Cvbeli' ella enlarged se\ en 



diameters ........... 598 



