REFERENCES TO THE PLATES. 471 



PLATE XXIX. 



Figures all of the natural size, except 7, 8, 11-14. 



Fig. 1. Squalodon pelagius. See page 420. 



Fragmeut of an intermediate portion of the left maxilla, reversed in position. From the eocene forma- 

 tion of Ashley River, South Carolina. Besides a true molar it exhibits the sockets of a premolar and 

 two other molars, and intervening depressions externally to accommodate the teeth of the opposed jaw 

 when at rest. 



Figs. 2-5. DoRUDON serratus. See page 428. 



Teeth. From the eocene of Alabama. 



Fig. 2. Outer view of a canine tooth. 



Fig. 3. Outer view of a premolar. 



Fig. 4. Outer view of a true molar. 



Fig. 5. Outer view of a posterior true molar. 



Fig. 6. DoRUDON SERRATUS. See page 430. 



A mutilated premolar tooth. From the eocene formation of Ashley River, South Carolina. 



Figs. 7-8. Squalodon pygm^us. See page 420. 



Figures one-half the diameter of nature. 



Fig. 7. View of the right side of the skull. The intermaxillary bone has been introduced from the 

 left side of the specimen, which is otherwise not so well preserved. 



Fig. 8. Upper view of the skull. 



Fig. 9. Squalodon Holmesii? See page 419. 



A canine tooth. From the eocene of Ashley River, South Carolina. 



Fig. 10. Phocageneus venustus. See page 426. 



Tooth. From the miocene formation of Virginia. 



Figs. 11, 12. Nanohyus porcinus. See pages 200, 389. 



Figures three times the diameter of nature. 



Fig. 11. External view of a fragment of the right side of the lower jaw, exhibiting in functional 

 position the last temporary molar and succeeding two permanent molars, and within the jaw the crown 

 of the last permanent premolar. 



Fig. 12. View of the triturating surfaces of the teeth. 



Figs. 13, 14. Omomy's Carteri. See page 408. Figures four times the diameter of nature. 



Fig. 13. Portion of the right side of the lower jaw, containing the last two j)remolars and the succeed- 

 ing two true molars, viewed externally. 



Fig. 14. View of the triturating surface of the second true molar, reversed in position, the fore part 

 being to the left, or the outside upward. 



PLATE XXX. 



Figs. 1-12, and 18, of the size of nature ; 13-17, two-thirds the diameter. 

 Figs. 1-3. Galera macrodon. See page 369. 



Fig. 1. Portion of the right side of the lower jaw, containing two premolars and the sectorial molar. 

 Figs. 2, 3. Outer and lower views of the upper sectorial molar of the left side. From Charles County, 

 Maryland. 

 Figs. 45, 46. Anchippodus eIpaeius. See page 403. Figures of the natural size. 

 Fig. 45. View of the triturating surface of an inferior molar. 



