398 University Geological Survey of Kansas. 



PLATE XLVII -A. 

 Bones of Xiphactinus audax Leidy, one-half natural size. 



Figs, la, b, c. — Superior, anterior and posterior views of first anterior verte- 

 bra. 

 Fig. 2. — Side view of second anterior vertebra. 



Figs. 3, 4, 5. — Third, fourth and sixth anterior vertebrae, seen from the side. 

 Figs. 6, 8. — Haemal arches and spines. 

 Figs. la, b. — Posterior and side views of vertebrae from near the extremity of 



caudal fin: cen, centra; hs, haemal arch and spine. 

 Fig. 9. — Superior view of maxilla and premaxilla. 



PLATE XLVII B. 



Fig. 1. — Xiphactinus audax Leidy, portion of caudal fin, showing the upturned 

 condition of the vertebral centrae in this region, about one-half natural size. 

 Fig. 2. — Top view of skull of Ichthyodectes hamatus Cope. 



PLATE XLVIII. 



Figs, la, b, c. — External and internal views of maxilla and side view of pre- 



dentary of Saurodon broadheadi Stewart, two-thirds natural size. 

 Fig. 2. — Dentary of Xiphactinus loivii Stewart, two-thirds natural size. 



PLATE XLIX. 



Ichthyodectes anaides Cope, one-half natural size. 



Fig. 1. — Skull: eth, ethmoid; fr, frontal; so, supraoccipital ; epo, epiotic; 

 ptot, pterotic ; pofr, postfrontal; pfr, prefrontal; opt, opisthetic; pro, 

 prootic; bo, basioccipital; v, vertebra; bs, basisphenoid ; par, parasphe- 

 noid. 



Figs. 2a, b. — Maxilla and dentary. 



Fig. 3. — Hyomandibular, probably belonging to this species. 



Fig. 4. — Skull of Ichthyodectes or Gillicus, one-half natural size: pa, 

 parietal ; other lettering as in fig. 1. 



Figs. 5, 6, 7. — Mandible, posterior end of maxilla and quadrate of Ichthyo- 

 dectes ctenodon f Cope, one-half natural size. 



PLATE L. 



Ichthyodectes hamatus Cope, one-half natural size. 

 Figs, la, b. — Side and top views of maxilla. 

 Figs. 2, 3. — Top and side views of palatine. 

 Fig. 4. — Preoperculum. 

 Fig. 5. — Quadrate. 



