2 JouriKil of Kiitoniolojiy and Zoologx 



model. The larger model gives a picture of the mucous membrane 

 and the nasal chambers, the smaller shows the shape of the nasal 

 chamber. The knob on the inner side of the larger model is Jacob- 

 son's organ. The drawings are by Elizabeth Keyes. 



(Contribution from Zoological Laboratory of Pomona College.) 



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Upper figure section of the model of epithelium. 

 Lower figure model of epithelium from the outside, 

 little elevation in the lower center. X40. 



Jacobson's organ, the 



