Stewart.] Cretaceous Fishes, 399 



PLATE h— continued. 



Figs. Ga, b. — Posterior and top views of first anterior vertebra. 



Figs. 7a, b. — Side and top views of maxilla and premaxilla Ichthyodectes 



<■ rue nl/s Hay. 

 Figs. Set, b. — External and internal views of premaxilla. 

 Fig. 9. — Front view of dentary bones. 

 Figs. 10a, b. — Top and side views of maxilla of type specimen from Professor 



Hay's collection. 



PLATE LI. 

 Ichtht/odectes acanthicua [f) Cope, one-half natural size. 

 Figs. 1, 2. — Superior and side views of maxilla. 

 Figs. 3, 4. — External and internal views of mandible: den, dentary; aut, 



autarticular: der, dermarticular. 

 Figs. 5<7, b. — External and internal views of premaxilla. 

 Fig. 6. — Portion of scapula. 

 Fig. 7. — Palatine seen from side. 

 Fig/8. — Side view of vertebra?. 

 Figs. 9a, b, c, d. — Pectoral fin-spines and rays. 

 Fig. 10. — Pelvic actinosts. 



Fig. 11. — Portion of caudal fin, probably of this species. 

 Fig. 12,—Tchthyodfctes ctenoelon Cope, ceratohyal. 

 Fig. 13. — Bone of uncertain position. 



PLATE LII. 

 Gillieus arcuatus Cope, one-half natural size. 



Fig. 1. — Skull: eth, ethmoid; fr, frontal: pa, parietal: .so, supraoccipital: 

 epo, epiotic; ptot, pterotic; pofr, postfrontal; hmnd, hyomandibular; 

 pfr, prefrontal; sc, sclerotic ring. 

 Fig. 2. — Maxilla, external view. 



Figs. 3, 4, 5.— External and internal views of mandibles. 

 Fig. 6. — Ceratohyal. 

 Fig. 7. — Quadrate. 

 Fig. 8. — Palatine and mesopterygoid. 

 Fig. 9. — Preoperculum. 

 Fig. 10. — Fragment of sclerotic ring. 



PLATE LIII. 



Palato-quadrate arch and opercular bones of Oillicus arcuatus Cope, about 

 seven-tenths natural size: 7, quadrate: mtpg, metapterygoid : pg, ptery- 

 goid; pop, preoperculum: op, operculum. 



