THE NASAL REGION IN EUTAENIA. 395 



The gland extends from the transverse prenasal wall to a point 

 immediately behind the fleshy union of the jaws. The lobules are 

 larger and reach higher as they are followed backward. 



A large gland fills up the space between the cartilaginous prenasal 

 wall and the apex of the snout. It is termed the " snout gland," and 

 and is shown by Reichel to be but a separately developed portion of 

 the upper lip gland. Its ducts open in the depressions placed 

 laterally from the head of the palatal crest. This shows it to be a 

 paired gland, but the acini of lobules from one side are directed ini 

 every manner amongst those of the other side ; as Reichel 

 points out, they are quite separate at an early stage. The cellular 

 structure is very similar to that of the upper lip gland, and possesses 

 also the yellowish tinge. The lobules reach up nearly to the posterior 

 end of the ascending premaxilla. 



The Nasal Gland of Midler is situated on the lateral wall of the 

 nasal cavity, from which it is separated by the turbinal cartilage, 

 and the septomaxillary ; as already described, it conforms itself to a 

 concavity on the outer face of turbinal cartilage. As the concavity 

 deepens to form a tube, a portion of the gland is included in it to its 

 blind termination. It does not reach farther behind than the 

 turbinal ingrowth, and anteriorly than the Organ of Jacobson. 

 The duct, however, is continued, first on a level with the tur- 

 binal ingrowth, then on the lower outer surface of the nasal wall 

 which position it keeps till it reaches the anterior nasal opening, on 

 the lower posterior edge of which is found its flask-like aperture. 

 Fig. 7 is a representation of a transverse section at this point, with 

 ap the aperture over a broad groove, which in front of this forms the 

 floor of the nasal cavity. 



The cells of this gland are provided with large distinct nuclei and 

 a protoplasm but little granular and staining very deeply. Their 

 shape is generally cubical, approaching to cylindrical. The acini are 

 arranged in horizontal layers separated by connective tissue, nerve 

 fibres and capillary vessels, and are perfectly circular in transverse 

 section. The main duct is continued behind, about the centre of the 

 gland. 



The mucous membrane lining the floor of the nasal passage is 

 folded in a remarkable manner, reaching out into and narrowing its 

 lumen ; its constituents are ciliated cylindrical cells and goblet cells. 

 Below these is found a layer of cells whose characteristics change 



