Stewart.] Cretaceous Fishes, 403 



PLATE LXIX. 



Fig. 1. — Pachyrhizodus leptognathus Stewart, natural size: den, dentary; 



art, articular: q, quadrate: pop, preoperculum; op, operculum ? ; a, bone 



of uncertain position. 

 Fig. 2. — Pachyrhizodus velox Stewart, one-half natural size: m.v, maxilla; 



den, dentary: art, articular; hy, bone of uncertain position, probably a 



ceratohyal, natural size. 



PLATE LXX. 



Fig. 1.— Pack y rid zodus Uptopsis Cope. — Internal view of dentary, one-half 



natural size. 

 Fig. 2. — Superior view of dentary of Pachyrhizodus caninus Cope. 

 Fig. 3. — Premaxilla. 

 Fig. 4. — Bone of uncertain position. 

 Figs. 5, 6. — Superior and posterior views of vertebra. 

 Figs. 7, 8. — Posterior and side views of basioccipital of Pachyrhizodus lati- 



mentum t Cope. 

 Figs. 9, 10. — Superior and posterior vertebra? of same. 

 Fig. 11. — Palatine of Enchodus pctrosus Cope. 

 Fig. 12. — Palatine of Enchodus dolichus Cope. 

 Fig. 13. — Dentary of Enchodus, sp. 

 Fig. 14. — Internal view of dentary of Enchodus dirus Leidy. 



PLATE LXXI. 

 Shoulder-girdle and pectoral fin of Pachyrhizodus, about one-half natural size. 



PLATE LXXII. 



Fig. 1. — Leptichthys agilis Stewart, about one-half natural size. 

 Fig. 2.—Syhemus latifrons Cope, slightly under one-half natural size. 



PLATE LXXIII. 



Leptecodon rectus Williston, about three-fifths natural size. 



