214 DEVELOPMENT OF THE MARSUPIAL SKULL. 



Plate XV. 

 Fig3.2I-'24. — Sections through the posterior part of the head of 14mm. 

 mammary foetus of Trichositrus vulpecida{ x 30). 



Plate xvi. 



Fig. 25. — Underview of reconstruction of the skull of 8 mm. mammary 

 foetus of Dasyurus viverrmus{x^O). The membrane bones have 

 been removed from the right side; and Meckel's cartilage, the 

 malleus, incus, stapes, and hyoid from both sides. 



Fig. 26. — Side view of same( x 40). 



Fig. 26a. — Malleus, incus, and stapes of same. 



Plate xvii. 

 Figs. 27-32. — Sections through the skull of 8 mm. mammary fcetus of 

 Dasyurus riverrinus{ x 30). 



