EXPLANATION OF PLATES, PART II. 



PLATE XXIII. 



Kansas Cretaceous Sea. (Page 234.) 



PLATE XXIV. 



Figs. 1, la, lb. — Lamna sulcata Geinitz, after Leidy, natural size. 



Figs. 2, 2a. — Scapanorhynchus rhaphiodon (texana) Agassiz, natural size,. 

 after Leidy. 



Fig. 3. — Leptostyrax bicuspidatus Willist., from the side, natural size. 



Fig. 6. — Scylliorhinus (Lamna?) gracilis Willist., enlarged. 



Figs. 7, 8. — Scylliorhinus planidens Willist., enlarged. 



Fig. 5. — Scylliorhinus rugosus Willist., enlarged. 



Figs. 9, 10. — Fragments of undetermined teeth from Kiowa shales. 



Fig. 11. — Coelodus stantoni Willist., imperfect right splenial dentition, natural 

 size. 



Fig. 12. — Cozlodus brownii Cope, imperfect left splenial dentition, natural size~ 



Figs. 13, 13a. — Amphibian atlas from Laramie Cretaceous. 



Fig. 14. — Undetermined shark tooth (Coraxf) from Benton of Colorado, en- 

 larged. 



Figs. 15, 15a. — Leptostyrax bicuspidatus Willist., natural size. 



Middle figure of plate — Selachian verbebra (Coraxf) from Niobrara Cretaceous^ 



PLATE XXV. 



Ptychodus mortoni Mantell, natural size. 



PLATE XXVI. 



Fig. 1. — Ptychodus mortoni Mantell, part of dentition of upper jaw, as pre- 

 served in the matrix, four-sevenths natural size. 



Figs. 2, 4. — Scapanorhynchus rhaphiodon Agassiz, natural size. 



Fig. 3. — Lamna appendiculata Agassiz, natural size. 



Fig. 5. — Lsurus mantelli Agassiz, natural size. 



Fig. 6. — Coelodus stantoni Willist., crowns of two teeth from internal row r 

 lower jaw, much enlarged. 



Fig. 7. — Leptostyrax bicuspidatus Willist., enlarged. 



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