56 
THE DOC Ss smUL, 
mesethmoid is a thin plate-like bone, forming 
a median partition between’ the olfactory 
chambers ; dorsally it is attached to a ventral 
process of the nasals.t. The ventral border 
of the mesethmoid is thickened and lodged in 
the dorsal portion of the vomer. The vomer, 
in the portion shown in section, forms a complete 
N 
N _ PMs 
Fig. 11.—Transverse section through the anterior portion 
of the nares. (w.E.c.) 
M X. Maxilla. N. Nasal. NP. Nasal Passage. P.M X. Pre-maxilla. 
S.N. Septum nasi. 
septum between the right and left nasal pass- 
ages, by meeting ventrally with the palatines. 
Dorsally it is trough-like, or V-shaped; the 
two lateral arms embracing the ventral border 
of the mesethmoid. From these lateral arms, 
* In old skulls the nasals fuse, and this process is very distinct. 
