428 ^- B- POLLARD, On the Anatomy and Phylogenetic Position of PolypterttS. 



with many folded walls. Centrally runs the enormous olfactory nerve. 

 The ethmoidal groove is seen containing the ophthalmicus superficialis 

 and profundus. Below, the entopterygoid riins far beneath the para- 

 sphenoid and is bound to it by ligament. Below the nose the intra- 

 nasal branches of the palatine nerve are seen. 



Fig. 34. Section through nasal capsule in front of the ethmo- 

 palatine articulation. In the anterior suborbital bone a mucous ampulla 

 with tall epithelium is seen. The prepalatine cartilage is seen bone 

 forming at first in the palatine bar only at the ossification. A branch 

 of the Ramus buccalis is approaching the nasal cavity to form the 

 nasalis internus. The Rami ophthalmici superficialis and profundus are 

 seen to lie within the cartilaginous nasal capsule though certain bran- 

 ches previously given off run to the dermal bones and mucous canal. 

 In the nasal the mucous canal opens to the exterior. 



Fig. 35. Section through the Jacobson's organ. The nasal passages 

 are cut the lower leading to the inhalent posterior aperture and the 

 upper to the tentacle. The dermethmoid and os terminale are shown. 

 The latter may be the rudiment of the prefrontal. Above are seen the 

 terminal branches of the ophthalmici superficialis and profundus. The 

 nasalis internus of the buccal has penetrated the nasal capsule and lies 

 at the edge of the nasal opening in the cartilage. The palatal pro- 

 longation of the premaxilla reaches the parasphenoid. 



