318 MAMMALIAN ANATOMY 



sphenoturbinal, has lost its relations with the ethmoid and is per- 

 manently attached to the sphenoid as part of the anterior wall of its 

 body. A large cavity in front of the superior incision on the medial 

 surface, which runs obliquely forward and inward, may correspond 

 with the large scroll numbered 6 on the medial surface of the cat's 

 ethmoid. All these modified scrolls are grouped about a central 

 partition which runs forward and joins the anterior end of the middle 

 turbinated bone, the posterior wall of the ethmoidal cleft, and the 

 lower ends of the infundibular scrolls ; hence it may be regarded as 

 equivalent to the partition of the large fourth piece in the lateral 

 ethmoid of the cat. 



