THE RABBIT 211 



in the back part ? These are the jaw teeth or molars. Notice 

 how they articulate with each other. Note the front teeth, 

 incisors, above and below. Note how they articulate, and 

 how they are used. Do you think the rabbit is likely to 

 have toothache? Note the area without teeth. Is this an 

 advantage? Why? Study the roof of the mouth. Are 

 the corrugations of any value? Draw upper surface of 

 mouth, showing and naming the parts studied. 



V. (i) — The Skeleton. — (a) Note the divisions of the 

 skeleton into skull, spinal column and appendages. Sever 

 the head from the cervical vertebrae, noting the method 

 of articulation of the condyles of the head and the atlas of 

 the spinal column. 



(b) Replace the bone which was cut out to remove the 

 brain and study the bones of the skull. The following 

 bones may be easily seen : the occipital, through which the 

 spinal cord goes ; the small interparietal, between the two 

 larger parietals, larger and curved ; the frontals, the nasals 

 above the nostrils, and the premaxillaries , from which the 

 incisor teeth grow. How are the bones of the skull connected ? 

 Note the bones on the outer boundary of the eye orbit, the 

 zygomatic process. Draw upper view of the skull. 



(c) View the skull from the lower side. The maxil- 

 lary bone is behind the premaxillary, and contains the molar 

 teeth. Then follow several small bones, which terminate 

 at the ear bone and unite with the squamosal, the larger 

 side bone which joins the occipital. Study the ear bone, 

 the tympanic ; cut open the coil and note the winding bone, 

 the cochlea, through which sound is conveyed to the inner 

 part of the ear and finally to the auditory nerve. What is 

 the value of such a bone ? Between the tympanic membrane 



