PLATE VI. 



Eiichodns petrosus Cope. 



Figure 1. — Almost complete tail: cdv, caudal vertebra; cdr, caudal 

 fin rays; hy, hypural; h, hsemapophysis; n, neuiapophysis. x %. No. 

 806. 



Fig. 2. — Right palatine fang, showing the scars left bj' former fangs. 

 X Vz. No. 126. 



Enchodus dirus Leidy. 



Fig. 3. — Portion of cranium, right view: ang, angular; art, articular; 

 art', left articular; br, branchiostegals; den, dentary; eth, ethmoid; /, 

 fang of palatine which lies under the premaxillary ; he, hypercsracoid; 

 hm, hyomandibular ; ms, mesopterygoid; m.t, metapterygoid; mx, maxil- 

 lary; op, opercular; pop, preopercular; qa, quadrate; .sop, subopercular. 

 X V2. No. 817. 



Fig. 4. — Same as figure 3, left view: pal, left palatine; pal', right 

 palatine; c, ceratohyal; pt, pterygoid; g, girdle bone, probably the 

 clavicle. X %. No. 817. 



