64 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 76 



PLATE 5 

 Lateral aspect of skulls of zeuglodont, fig. i and toothed cetaceans, figs. 2-5. 



Fig. I. Prozciiglodon (from C. W. Andrews). 



Fig. 2. Agorophius (from True). 



Fig. 3. Archaodelphis (from G. M. Allen). 



Fig. 4. Dclphinus. No. 21525, U. S. Nat. Mus. 



Fig. 5. Mcsoplodon. No. 23346, U. S. Nat. Mus. 



Fig. 6. Xcnorophus. No. S. 402 W., Sloan Collection, 

 skull from slightly in front and above, to bring 

 terraced character of the maxillary, as shown by the level areas in 

 the regions marked mx and a. pr. and the abruptly sloping area be- 

 tween them, and the wide overlapping of the maxillary and inter- 

 maxillary in the interorbital region; the upper dotted line indicates 

 the original position of the maxillary border as shown on the oppo- 

 site side of the specimen ; the lower dotted line indicates the approxi- 

 mate position of the lower border of the intermaxillary as seen in 

 posterior view.) For other figures of Xcnorophus see Kellogg, 

 Smithsonian Misc. Coll., Vol. 76, No. 7, pis. 1-2, July 25, 1923. 



(View of the type 

 out particularly the 



i 



