304 CHORDATA. 
in orbits which are mainly formed by the adsphenords, orbito- 
sphenowds, frontals and other bones, but the anterior corner 
is completed by a Zacrymal bone which develops especially in 
connection with the eye. 
The nasal capsules have several bones which are thin and 
coiled in order to present a large surface. They are called 
the ¢urdinals and are attached to the ethmoid, nasal and 
maxilla. Hence they are called ethmo-, naso- and maxillo- 
turbinals. 
Fig. 281.—LATERAL VIEW OF SKULL OF THE RassBit. (dd nat.) 
Lacrymal. 
Alisphenoid. | Orbitosphenoid. 
Frontal. Maxilla. 
Squamosal. j 
Parietal. 
‘ Nasal. 
Interparietal. 
Supra- 
occipital. Pre- 
‘ maxilla, 
Periotic. 
Tympanic. 
Mastoid 
Process. 
Paroccipital . 
Process. Second 
Incisor. 
4% 
Periotic. “ 
Pterygoid. ’ 
Malar. 
These all form the cranium, and to them are added 
a number of bones which arise in connection with the first 
two visceral arches and form the main part of the facial 
region. The premaxil/a and maxilla form all the anterior 
region of the skull below the nasal chamber. Above the 
maxille the small vomers are found. They are hidden by 
the palatine processes of the maxille. The alatines and 
plerygoids lie in the roof of the mouth. The sguamosal is a 
large and important bone which lies between the auditory 
bones and the sphenoid ring ; it has a glenoid cavity for the 
