N't). I I 



FOSSIL TOOTHED CETACEAN — TRUE 



EXPLANATION OF PLATES 

 Hcspcrocctus calif ornicus, new genus and species 

 Plate i 

 Fig. I. Mandible. Superior aspect. 

 2. Mandible. Inferior aspect. 



Both figures natural size. 



1 3 pe. 



Fig. i. 



2, 



3 

 4 



5 



Plate 2 

 Mandible. Lateral aspect. Left side. Natural size. (The inferior 



margin is complete below the posterior foramen.) 

 Tooth No. i. Postero-internal surface. 

 The same. Anterior surface. 

 Tooth No. 2. Internal surface. 

 The same. Anterior surface. 

 Tooth No. 3. Postero-internal surface. 

 The same. Antero-external surface. 



All the figures of teeth twice natural size. 



