EXPLANATION OF PLATE LXIX. 



Pleuracanthus (Diplodus) Icevissimus, Agass. 

 (Reduced to half diameter.) 



a. Eight ramus of lower jaw. 

 a.' Artieulatory surface. 



b. Anterior extremity of left ramus of lower jaw. 



c. Dentary surface, with teeth. 



d. Extremity of the palato-quadrate. 

 e. 



f- ) 



g. Detached gill-rakers. 



I., n., ra., rv. Bones of the branchial arches. 



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

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



[10] 



