NORTH STAFFORDSHIRE COAL FOSSILS. 247 



Hist., ser. 4, 1868.) One imperfect specimen of this species 

 has been found. The tooth plate is very thin and much 

 flattened ; the upper surface covered with five transverse, 

 angular, smooth ridges. 



Position and locality : Moss coal shale, Fenton. 



Ctenodus imbricatus, Atthey. (Ref., Ann. and Mag. Nat. 

 Hist., ser. 4., vol. for 1868.) Several specimens of this 

 rare form have occurred. " The tooth is depressed, very 

 thick, hollow or slightly concave ; it has six ridges or plaits, 

 which enlarge rapidly towards the outer margin ; they are 

 strong, smooth, and somewhat distant from each other." 

 (Ibid.) 



Position and locality : Gubbin ironstone, Shelton ; Brown 

 mine, Silverdale ; Deep mine ironstone, Longton. 



Ctenodus obliquus, Atthey. (Ref., Ann. and Mag. Nat. 

 Hist., ser. 4, vol. for 1868.) This species is very rare. 

 Two specimens of palatal teeth have been found ; they 

 are lanceolate in form ; the upper surface is covered with 

 six or seven transverse ridges. 



Position and locality : Rare ; Deep mine ironstone, 

 Longton. 



REPTILIA. 



Animals of this class are rare in these coal-measures. 

 So far as we yet know they are confined to two or three 

 beds in the upper division of the Pottery coalfield. Good 

 specimens of jaws, teeth, vertebras, and rib bones, together 

 with portions of the skull of several individuals, have been 



