300 



Mr. D. M. S. Watson on 



Fig. 4. 



Par. 



Ibst. 

 Pt.-BL.^:^ mremFoss. 

 PtParFoss. ^ *' 



Ems 



P.Fr 



Par. 



mFoss. 



Fi. 





Fig. 



Fig. 

 Fig. 



Ficr. 



4. — Dimkmodon brouni, R.3oS7. X 1. From tbe hack. References 



as in the preceding figures, with : f(yr.mo(/., foramen magnum ; 



Fost.Tetn.Foss., posterior temporal fossa. 



5. — Diademodoii brojvtii, R. 3r)87. Side view tif hrain-ca.<e, the 



zygoma heing supposed removed, si.ca , "sinus canal.'' 



(i. — Diademoihn /iroioii, R. 3587. X 1. Riuht tympanic cavity 



from helow and the ri<;ht. li.Sp., basi^phenoid ; /eu.vest., fenestra 



vestihuli : Pit.F.. ]iituitary fossa. 



8. — Diaileiuodon jwh/p/HU/us, type specimen. Left quadrate and 



surrounding bones from below 



