Bawden, Nose and Jacobsoris Organ. 151 



Fig. 4. Olfactory end-cells of Rana virescens; a and l>, as above. 



Fig. j. Same, showing connection with nerve filaments. 



Fig. 6. Sensory end-cells of olfactory epithelium of Trutta fario . 



Fig. 7. Same as Figs. 4 and 5. 



PLATE VIII, Figs. 1-6. 



Fig. 1. Camera drawing of horizontal section of right and left nasal cav- 

 ities of tadpole, younger than the one figured in Fig. 5, Plate X, as young as 

 that figured in Fig. 5, Plate XI. This section is indicated for convenience 

 upon the same model as the above. See at A, Fig. 5, Plate X. 



Fig. 2. Camera drawing of transverse section of right cavity of younger 

 tadpole, as young as that figured in Fig. 5, Plate XI; plane of section indicated 

 as above in Fig. 5, Plate X, at F. 



Fig. j. Camera drawing of transverse section of right olfactory cavity of 

 Hyla versicolor, showing origin of nasolachrymal. 



Fig. 4. Camera drawing of same, showing nasolachrymal as a duct in 

 cross-section. 



Fig. j. Same, showing inner ventral diverticle, also nasolachrymal. 



Fig. 6. Same, showing internal nares. 



PLATE IX, Figs. 1-6. 



Fig 1. Camera drawing of a portion of nasal cavity of Ambly stoma punc- 

 tatutn, showing Jacobson's diverticle, the nasolachrymal duct in cross-section 

 and a portion of the general nasal cavity. 



Fig. 2. Camera drawing of transverse section of nasal ,sac and Jacobson's 

 organ of black-snake embryo. 



Fig. j. Camera drawing of longitudinal section of black-snake embryo, 

 showing nasal sac and Jacobson's organ opening into the mouth cavity. 



Fig. 4. Same, showing Jacobson's organ opening into mouth cavity. 



Fig. 3. Same, showing nasal sac completely enveloping Jacobson's organ. 



Fig. 6. Camera drawing of ihorizontal section of nasal sac and Jacobson's 

 organ of Eutenia, showing papilla projecting into the lumen of Jacobson's 

 organ. 



PLATE X, Figs. 1-7. 



Fig. 1. Camera drawing of horizontal section of right nasal cavity of tad- 

 pole, Rana virescens, modelled in Fig. 6, Plate XI, and Fig. 5, in this plate. 

 The plane of this section is indicated on the model in Fig 5, at D. 



Fig. 2. Camera drawing of horizontal section of same. Plane of section 

 seen at E. 



Fig- 3. Camera drawing of horizontal section of same. Plane of section 

 seen at B. 



