404 
THE NASAL REGION IN EUTAENIA. 
Ne, nc.’ .. Cartilage surrounding anterior nasal opening. 
? f—) 
Tr. 
Une. 
Ine. 
Fia. 
Fie. 
Fia. 
Fia. 
Fic. 
Fia. 
Fia. 
Fia. 
Fie. 
Fig. 
Fic. 
. Transverse plate of cartilage passing from the pedicle of the 
Organ of Jacobson to the turbinal cartilage. 
.. Upper nasal chamber. 
.. Lower nasal chamber. 
1.—A view of the roof of the mouth in Eutaenia sirtalis ; several times 
magnified. 
2.—A transverse section of the nasal region through the middle of the 
Organ of Jacobson. x20: 
3.—One half of a transverse section of the nasal region through the 
openings of the Organ of Jacobson and the lachrymal duct. 
20. 
4.—A transverse section some distance behind that represented in 
Fig. 3. x 20. 
5.—One half of a transverse section of the nasal region of an embryo 
head 6 mm. in length of Eutaenia sirtalis. x 50. 
6.—A transverse section of the nasal cavity anterior to the external 
nasal opening. x 30. 
7.—A transverse section of the nasal cavity containing the aperture 
of the duct of Miiller’s Nasal Gland. x 30 
8.—A portion of a transverse section of Organ of Jacobson in an adult 
Kutaenia ; J. C. the canal of the Organ separating roof and floor ; 
a, capillary vessel descending between columns, one of its 
branches passing to the left around the point of passage of the 
censory cells adjacent to superficial cells over into those of a 
column. Separating the columns also is seen pigmentary tissue. 
Above, the mucosa contains a nerve bundle cut across and a 
large capillary. x 250 
9.—A portion of the foregoing—a, superficial cells ; the peripheral pro- 
cesses of the sensory cells pass down between them and through 
the ‘‘ border structure” ; 6, sensory cells opposite a node (d) of 
the capillary plexus ; c, those opposite a mesh of the same and 
passing over into b’ those of the columns. (The outer ends of 
the sensory processes and of the superficial cells are represented 
diagrammatically. ) x 700 
10.—A transverse section of the posterior ends of the cellular columns 
of the Organ of Jacobson in an embryo Entznia. The plexus 
separating the polygonal areas is not shown. x 200 
11.—A longitudinal (diagrammatic) section of the lachrymal duct; a, 
the basal portion found under the Organ of Jacobson and con- 
tinued into b, ending blindly ; to the walls of this latter the 
fused lachrymal cartilages are applied; c, a swelling of the 
lumen of the duct over the palatine bone ; d, the portion on a 
level with turbinal. The gland is supposed to be seen through 
the eyeball. 
Nore—In the figures the shaded portions represent membrane bone, while the dotted pro- 
tions are intended to designate cartillage. 
