144 



ZOOTOMY. 



of the septum, passes almost directly outwards, and then bending down- 

 wards, furnishes the lateral wall of the capsule, finally turning inwards, 

 towards the base of the septum to form its floor. Each capsule is per- 



7i a 



FIG. 37. Lacerta viridis. The chondrocraniuin from above (after 

 W. K. Parker) X 4. The cartilaginous parts are dotted, the mem- 

 branous spaces cross-hatched. 



al.s, alisphenoid : a.s.c, position of anterior semicircular canal : e.ri, 

 external nares : ep, epiotic : e.pt, epipterygoid : f.m, foramen magnum : 

 fo, fontanelle: h.s.c, position of horizontal semicircular canal: i.o.s, 

 interorbital septum : na, nasal capsule : o.c, occipital condyle : p.oc, 

 parotic process : pr.o, prootic : p.s*c> position of posterior semicircular 

 canal : s.n, septum nasi : s.o, supraoccipital. 



forated by the anterior nares in front, by the posterior nares below, 

 by the foramen for the olfactory nerve behind, and above by a cres- 

 centic slit, the olfactory fenestra. 



