1847.| OWEN ON EXTINCT ANTHRACOTHERIOID QUADRUPEDS. 141 
that have opposed its application in systematic zoology, and the addi- 
tion of other osteological characters, as the number of true vertebree, 
and of modifications of the stomach and cecum, which may tend 
to place the principle more truly before the eyes of the systematic 
Zoologist, and recommend it more favourably to his acceptance in the 
arrangement of the Ungulata. 
DESCRIPTION OF PLATE VII. 
Fig. 1. Grinding surface of the last upper true molar of Hyopotamus bovinus. 
Fig. 2. Outer surface of ditto. 
Fig. 3. Inner surface of ditto. 
Fig. 4. Hinder surface of ditto. 
Fig. 5. Fore surface of ditto. 
Fig. 6. Grinding surface of a series of five upper molar and premolar teeth of 
Hyopotamus vectianus. 
Fig. 7. Outer surface of ditto. 
Fig. 8. Inner surface, showing the connate inner fangs of the second upper true 
molar of ditto. 
Fig. 9. Grinding surface of a series of upper true molar and premolar teeth of dn- 
thracotherium magnum, half the natural size:—from the ‘Ostéographie’ 
of M. de Blainville, fasc. xxi. Anthracotherium, pl. 1. 
In each of the preceding figures, 
m 3 is the last molar ; 
m 2 is the penultimate molar ; 
m 1 isthe first molar; 
p 4 is the last premolar ; 
p 3 is the third premolar ; 
p 2 isthe second premolar. The letters on the grinding surface are explained 
in the text. 
Fig. 10. Outer side of first premolar of Hyopotamus (?). 
Fig. 11. Inner side of ditto. 
Fig. 12. Upper canine of Hyopotamus (?). 
Fig. 13. Upper incisor of ditto. 
Fig. 14. Inner surface of ditto. 
Fig. 15. Outer surface of ditto. 
Fig. 16. Inner surface of crown of an incisor of ditto. 
Fig. 17. Outer surface of ditto. 
Fig. 18. Inner surface of crown of another incisor of ditto. 
Fig. 19. Outer surface of ditto. 
Fig. 20. An incisor of Hyopotamus, outer surface. 
Fig. 21. Inner surface of ditto. 
Fig. 22. An incisor of Hyopotamus, outer surface. 
Fig. 23. Inner surface of ditto. 
Fig. 24. Side view of an upper incisor of Sus scrofa. 
Fig. 25. Inner surface of ditto. 
DESCRIPTION OF PLATE VIII. 
. Outside view of right ramus of mandible and teeth of Hyopotamus bovinus. 
. Inside view of part of left ramus of mandible and grinding teeth of ditto. 
Upper view of right ramus and symphysis of mandible and teeth of ditto. 
. Lower surface of symphysis of ditto. 
. Anterior surface of second molar and section of mandible of ditto. 
. Outside view of right ramus of mandible and teeth of Anthracotherium 
magnum, half the natural size :—from the ‘Ostéographie’ of M. de Blain- 
ville, fase. xxi. Anthracotherium, pl. 1. 
Fig. 7. Upper view of ditto, with the grinding teeth :—from the same work. 
a 
. m2 Oe e . 
Om OO DOr 
