PLATE XV. 



Enchodus Shumardi Leidy. 



Figure 1. — Nearly complete skull: art, articular; hr, branchiostegals; 

 d, clavicle; ch, ceratohyal; pop, preopercular; den, dentary; eth, ethmoid; 

 fr, frontal; hm, hyomandibular; 7ns, mesopterygoid ; tnt, metapterygoid ; 

 op, opercular; pa, parasphenoid; pal, palatine; pmx, premaxillary; pt, 

 pterygoid; qu, quadrate; r, ribs; sop, subopercular. x %. No. 829. 



Fig. 2. — Nearly complete preopercular, pop, subopercular, sop; and 

 fragment of opercular, op. x %. No. 823. 



Fig. 3.— Complete dentary. x %. No. 824. 



Fig. 4. — Fragmentary dentary. Type of Enchodus parvus Stewart. 

 X %. No. 321. 



Fig. 5. — Fragmentary dentary. 



Fig. 6. — Fragmentary dentary. 



Fig. 7. — Fragmentary dentary. 



Fig. 8.— Palatine, x M- No. 838. 



Fig. 9. — A palatine fang, x %. No. 828. 



Fig. 11. — den, right dentary; den', left dentary; pal, palatine; pmx, 

 premaxillary; pop, pi-eopercular; pt. pt', pterygoids; qu, quadrate; sop, 

 subopercular. x %. No. 827. 



Fig. 13. — Impressions in chalk of a pair of palatines, x %. No. 377. 

 Enchodus dolichus Cope. 



Figure 10. — Mandible: dew, dentary; art, articular, x %. No. 156. 



Fig. 12. — den, dentary; pal, right palatine; pmx, premaxillary. The 

 left palatine lies on the upper edge of the premaxillary. X %. No. 832. 



Enchodus pctrosns Cope. 



Figure 14. — A palatine with the fang, showing the base of the discarded 

 fang not yet absorbed, x % . No. 807. 



Fig. 15. — Ventral view of a palatine, showing the openings of the old 

 blood cavities, on the crescentic scars of discarded fangs, and at the 

 middle of the base of the last fang, which has been broken off. X Va. 

 No. 824. 



