664 E - B - BRANSON 



PLATE V 

 All figures are of Deltodns mercurii Newberry. 



Fig. i. — Top view of median mandibular tooth with outer end missing 

 (No. 712). 



Fig. 2. — Lateral view of complete left outer mandibular tooth; X4/5 

 (No. 712). 



Fig. 3. — Top view of same tooth; Xo/io. 



Fig. 4. — Lateral view of complete left maxillary tooth; X4/5 (No. 712). 



Fig. 5. — Top view of same tooth. 



Fig. 6. — Top view of right mandibular tooth with outer end missing 

 (No. 712). 



Fig. 7. — Lateral view of mandibular tooth with outer end missing; X5/6 

 (No. 716). 



Fig. 8. — Top view of right outer mandibular tooth with outer end missing; 

 X2/3 (No. 716). 



Fig. 9. — Top view of left outer mandibular tooth with outer end missing 

 (No. 712). 



Fig. 10. — Top view of right maxillary tooth restored after Fig. 5 for com- 

 parison with Fig. 4a of the type; X3/4; markings like those on the outer 

 end of the specimen cover the entire surface of unworn teeth (No. 716). 



Fig. 11. — Side view of the tooth shown in Figs. 4 and 5. 



The specimens figured as 7 and 8 are from the Bull Lake Creek region, Wyoming, 

 and the others from the Big Popo Agie region, Wyoming. 



PLATE VI 

 All figures are of Deltodns mercurii Newberry. 

 Fig. 1 — Restoration of upper and lower dentition viewed from the rear; 



XqAS- 



Fig. 2. — Restoration of upper dentition; right tooth restored; X9/15. 



Fig. 3. — Restoration of lower dentition; stippled area of inner tooth 

 of left side and outer of right restored; X 5/8. 



Fig. 4.— Mandibular tooth from the Embar for comparison with the type; 

 X 13/16; restored in outline. 



Fig. 5. — Side view of same tooth; Xi. 



Fig. 6. — Top view of type of Deltodus mercurii: mandibular tooth; X 13/16; 

 restored in outline; found in the Coal Measures, Santa Fe, New Mexico 

 (No. 462 of the collection of the American Museum of Natural History). 



