BY R. BROOM. 
575 
EXPLANATION OF PLATE. 
Eefekence Letters: — J.G., Jacobson's cartilage; J.D., Jacobson's 
duct; J.O., Jacobson's organ; n.s., nasal septum; p.n., prenasal ; 
Paw., pre vomer ; S.D., Stenson's duct ; S.C., Stenson's cartilage ; vv., 
veins. 
Figs. 1-3. — Transverse vertical sections through anterior part of Jacobson's 
organ ( x 25). 
Figs. 4-5. — Transverse vertical sections through anterior 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). 
