300 



Mr. D. M. S. Watson on 



Fiff. 4. 



Par. 



I Par / Bg. 



Post Tern Fo^ f^'' ma^- \| /ti/: oc. 

 Fio-. e. Fig. 8. 



Ft yQU 



mFoss. 



Fl.ParToss. 



Fig. 4. — Biademodon hroivni, R. 3587. X 1. From the back. References 



as in the preceding figures, with : for. mac/., foramen magnum ; 



Post. Tern. Foss., posterior temporal fossa. 

 Fig. 5. — Biademodon hrowni, R. 3587. Side view of brain-case, the 



zygoma being supposed removed, si.ca , "sinus canal." 

 Fig. 6. — Dkidetnodon broumi, R. 3587. X 1. Riuht tympanic cavity 



from below and the right. F.Sp., basisphenoid ; fen.vest., fenestra 



vestibuli ; Pit.F., pituitary fossa. 

 p\(T_ 8. — Biademodon polyphagus, type specimen. Left quadrate and 



surrounding bones from below 



