EXPLANATION OF PLATE LXX. 



Pleuracanthus (Diplodus) Javissimus, Agass. 

 Figure 



1. Head considerably crushed, with spine (natural size). 



rt. Right ramus of lower jaw, showing arrangement of teeth in situ. 



b. Lower jaw; left ramus. 



c. ? Hyomandibular. 

 {/. d. Cranial plates. 



e. Spine. 



2-9. Examples of so-called " Stemmatodus " (enlarged). 



Formation and Locality. — Low Main Coal Seam, Newsham, Northumberland. 

 Ex coll. — Atthey Collection, Museum of Natural History, Newcastle-on-Tyne. 



[12] 



