396 University Geological Survey of Kansas. 



PLATE XXXII. 



Figs. 1-1?. — Corax falcatus Agassiz, from a single individual. 

 Figs. 2-2?. — Isurus mantelli, from a single individual. 

 Figs. 3-3c. — Lamna appendiculata. 

 Figs. 4, 5. — Scapanorhynchus rhophiodon Agassiz. 

 Figs. 6, 7. — Isurus mantelli. 

 All six-sevenths natural size. 



PLATE XXXIII. 



Skull of Xiphactinus audax Leidy, one- third natural size : pmx, premaxilla ; 

 mx, maxilla; den, dentary; dar, dermarticular ; eth, ethmoid; fr, frontal; 

 pa, parietal ; soc, supraoccipital ; epot, epiotic ; ptot, pterotic ; pa, parietal ? ; 

 prf, prefontal; pfr, postfrontal; pal, palatine; sor, suborbital; suor, supra- 

 orbital; sc, sclerotic ring; ps, parasphenoid; su, jugal?; hm, hyomandibu- 

 lar; pop, preopercular ; op, opercular; sop), subopercular; q, quadrate; 1,2, 

 vertebrae; n, n, n, neural spines. 



PLATE XXXIV. 



Left mandible of Xiphactinus audax Leidy, external view, one-half natural 

 size: den, dentary; dar, dermarticular. 



PLATE XXXV. 



Left mandible of Xiphactinus audax Leidy, internal view, one-half natural size: 

 den, dentary ; dar, dermarticular; auar, autarticular; sp, supposed splenial. 



PLATE XXXVI. 



Xiphactinus audax Leidy, one-half natural size. 

 Fig. 1. — Sclerotic ring. 

 Fig. 2. — Premaxilla. 

 Fig. 3.— Maxilla. 



PLATES XXXVII, XXXVIII, XXXIX. 



Maxillae, preniaxillae and mandibles of Xiphactinus audax Leidy, one-fourth 

 natural size, showing the great individual variation in these parts. 



PLATE XL. 



i 

 T^o. 155. Maxilla, premaxilla and mandible of Xiphactinus brachygnathus 



Stewart. 



PLATE XLI. 



Superior maxillary condyles of Xiphactinus audax Leidy, one-third natural 

 size, showing variation in the same. 



