246 NORTH STAFFORDSHIRE COAL FOSSILS. 



inches in diameter, have been found, together with numerous 

 rib-bones and .other remains. Detached scales similar to those 

 figured and described by Messrs. Hancock and Atthey (Ann. 

 Nat. Hist. ser. 4, vol. 9) as belonging to Ctenodi have 

 been found in the Moss coal shale and Cockshead ironstone. 

 They measure two and a half inches in length and three 

 inches in breadth. The border of the scale for a width of 

 about half an inch is covered with fine strias. The centre of 

 the scale is also covered with strias, much finer than those 

 on the border. These bear a close resemblance to scales 

 figured by Dr. Newberry under the title of Rhizodus 

 quadratus (Geol. Surv., Ohio, p. 39, fig. 8.) 



Position and locality : Palates, Knowles, Deep mine, 

 Chalky mine, and Bassy mine ironstones, Fenton and 

 Longton ; Brown mine, Silverdale. Scales (?) Moss coal 

 shale, Fenton ; Cockshead ironstone, Adderley Green. 



Ctenodus tuberculatus, Atthey. (Ref., Ann. and Mag. 

 Nat. Hist., ser. 4, 1868.) Several specimens which we refer 

 to this species have occurred. The most prominent features, 

 as described by Mr. Atthey, are as follows (Ibid, p. 88) : 

 " Tooth, plate-like, thick, with an irregular ovate outline, 

 two and three quarter inches long, an inch and six-eighths 

 broad, the narrow end posterior ; the inner margin gibbous 

 or angulated in the centre ; the outer margin a little convex ; 

 the surface is slightly convex, and is furnished with twelve 

 or thirteen deep, sharp, parallel, approximate ridges, which 

 are strongly tuberculated towards the outer margin, and 

 divided by narrow, deep, angulated grooves." 



Position and locality : Knowles ironstone shale, Fenton. 

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



