DESCRIPTION OF PLATES. 



The Figures in the Plates have been selected to exhibit the general characters and 

 forms of the different classes ; and in most cases from objects of frequent occurrence, 

 that the details of structure may be more easily verified. 



PLATE I. MAMMALIA. 



Fig. 1. Human Scull. 



2. Incisive and canine teeth of Man. 



3. Molar tooth of Man. 



4. Scull of the Orang Outang. 



5. Scull of the Hedgehog, Erinaceus Europceus, showing the 



structure of jaws and teeth in an insectivorous quadruped. 



6. Molar teeth of the Hedgehog. 



7 Scull of the Beaver, Castor jiber, showing the structure of 

 the jaws and teeth of a gnawing quadruped. 



8. Scull of the Cat, Felis calus, showing the teeth and jaws 



of a carnivorous quadruped. 



9. Incisors and canines of the Lion, Felis Leo. 



10. Scull of a Dog. 



11. Molar tooth of a Dog. 



12. Scull of a Sheep, Ovis aries, to show the structure of the 



teeth and jaws in a ruminating quadruped. 



13. Molar tooth of the Sheep. 



14. Scull of the Horse, Equus caballus. 



15. Wing and feet of a Bat, to show the disposition of the 



fingers connected by membranes. 



16. Feet of the Elephant, Elephas Indicus. 



17. Hands of the Orang Outang, as exemplifying the struc- 



ture of Quadrumanous animals. 



18. Feet of the Hog, Sus scrofa. 



19. Feet of the Bear, Ursus Arclos, as exemplifying the mode 



of walking in a plantigrade quadruped. 



20. Feet of the Lion, showing the mode of walking in a digi- 



tigrade quadruped. 



