Yaianosaurus acutliostiis, Broili. 



301 



Interparietal. 



The interparietal is an almost flat bone, Avitli a low median 

 ridge on its posterior surface; it covers the hinder ends of 

 the parietals above, and its lower border overlaps the supra- 

 occipital, whilst its lateral borders are in contact with the 

 tabulares. In tlie specimen it is traversed by a vertical 

 crack which looks like a median suture ; as, however, it 

 turns out of the middle line towards the bottom, and as the 

 structure seems to show that the bone is single, I have 

 disregarded it. 



Tabular. 



The tabular is a thin bone lying entirely on the posterior 

 surface and covering the parietal, suprati mporal, s(iuamosal, 

 and supraoccij)ital. Owing to crushing, the suture with the 

 supraocvipital is not very clear on either side, and it is not 

 possible to say M'hether the bone reached down outside the 

 post-temporal fossa to the end of the paroccipital. 



5< 



?rr/?c 



L'Pt. 



yanmominus acutiroftri8,l^Y0\\\. Type specimen, X 1. Skull viewed 

 from beliind, with the vertebra column which covers the uiifhadtd 

 area supposed removed. 



Reference-letters as befoie. 



Occiput. 



The occipital and otic Ijones cannot be separately recog- 

 nized. The foramen magnum is of fair size, and above it 



