BY K. BROOM. 623 



Fig. 8. — Transverse section of Jacobson's organ in P. nasiifa (two-thirds 



grown), X 27. 

 Figs. 9-11. — Transverse section of region of Jacobson's organ in P. naauta 



(adult;, X U. 



Plate xliv. 



Pseudochirus, Petauroklex, and Petaurus. 



Figs. 1 - 3. — Transverse section of region of Jacobson's organ in Pseudo- 

 chirus peregrinus (mam. feet., head length S'omm.), x 40. 

 Figs. 4 - 7. — The same in P. peregrinus (adult), x II. 

 Figs. 8 - 9. — The same in Petauroides volans (adult), x 10. 

 Figs. 10-12.— The same in Petaurus hrerireps (adult), x 16. 



Plate .xlv. 



Trichosurus. 



Figs. 1 - 3. — Transverse section of region of Jacobson's organ in 7''richosurns 



vulpecufa (mam. fwt., head length 7'5 mm.), x 36. 

 Figs. 4 - 6. — The same in T. rulpei'u/a (mam. foet. , head lengtli 105 mm.), 



X 42. 

 Figs. 7 - 9.-— The same in T. rulp^scuhi fmam. fret., head length 20 mm.), 

 X 18. 



Platk xlvi. 



Trichosurus and, Pha-colarchis. 



Figs. I - 6. — Transverse section of region of Jacobson's organ in Trichosu- 

 rus vulpecula (adult), x 10. 

 Figs. 7 - 9. — Tue same in Phascolnrcfu.s rinereus (half grown), x 7. 



Plate xlvii. 



Alacrojrus and ^Epyprymnu<. 



Figs. 1 - 3. — Transverse section of region of Jacobson's organ in Macropus 



sp ? (early fceLus, body lengtli 29 mm.) 

 Figs. 4 - 9. — -The same in J/", vahtltatus (mam. fojt., head length 50 mm.), 



X 10. 

 Figs. 10-12. — The same in yEpi/jji/rmnus rn/escens (mam. fret., head length 



15 '5 mm.), x 25. 



Plate xlviii. 

 Phascolomys. 

 Figs. 1-2. — Transverse section of region of Jacobson's organ in Phas- 

 colomys iromhat (fietns, body length 19 mm.), after Riise, 

 X 37. 

 Figs. 3 - 7. — The same in P. mitchc'/i (half grown), x 6. 

 Figs. 8. — The same in P. mitrhelli (half grown), x 18. 



