BY R. BROOM. 575 



EXPLANATION OF PLATE. 



Eefekence Letters: — «7.(7., Jacobson's cartilage; J.D., Jacobson's 



duct; J,0., Jacobson's organ; n.s., nasal septum; p.n., prenasal ; 



P.m., pre vomer ; S.D., Stenson's duct ; S.G., Stenson's cartilage ; vv., 



veins. 



Figs. 1-8.— Transverse vertical sections through anterior part of Jacobson's 



organ ( x 25). 

 Figs. 4-5. — Transverse vertical sections through antei'ior and posterior 



parts of Jacobson's organ { x 60). 

 Fig. 6. — Section across posterior part of Jacobson's organ, showing its 

 relations and relative development ( x 12). 



