Tkue. — The fossil cetacean, Dorudon serratus. 



PLATE 1. 



Dorudon serratus Gibbes. 



Fig. 1. Portion of right premaxilla, showing alveolus of third upper incisor. 

 Lateral aspect. 



Fig. 2. Portion of right maxilla, with third and fourth upper premolars and first 

 molar (broken). Lateral aspect. (Gibbes, 1847, Plate 4, figure 1.) 



Fig. 3. Portion of left premaxilla, with third upper incisor (broken) ; and show- 

 ing impressions of third lower incisor and canine, and excavation 

 for anterior end of maxilla. Lateral aspect. (Gibbes, 1847, Plate 3, 

 figures 5-6.) 



Fig. 4. Portion of left maxilla, with second upper premolar, and alveolus of first 

 premolar. Lateral aspect. (Gibbes, 1847, Plate 4, figures 2 and 4.) 



