NORTH STAFFORDSHIRE COAL FOSSILS. 229 



Position and locality : Common in all parts of the 

 coal-field. 



Megalichthys coccolepls, Young and Thomson. (Ref., Brit. 

 Assoc. Report, 1869, p. 102.) Fragments of the head bones 

 and a few detached scales of this new species have been 

 found. The scales are rhomboidal, and both they and the 

 head bones have the upper surface covered with small round 

 tubercles. 



Position and locality : Cockshead ironstone, Adderley 

 Green ; Wood's mine coal shale, Longton ; very rare. 



Megalichthys rugosus, Young and Thomson. (Ref, Brit. 

 Assoc. Report, 1809, p. 102.) Several small jaws, con- 

 taining teeth finely striated ; also scales covered with tine, 

 confluent tubercles, which we, refer to this species, have 

 been found. 



Position and locality : Knowles and Deep mine iron- 

 stones, Fenton. 



GENUS CEXTRODUS, M'Cor. (Ref, Ann. Xat. Hist., 1848.) 



The characteristic features of teeth of this genus, 

 as defined by M'Coy, are, that they are " conical, slightly 

 curved, apex-pointed, circular in section, and very 

 finely striated longitudinally." We have several specimens 

 which possess the above characteristics. No scales or 

 bones have been found with the teeth, which may eventually 

 turn out to be only a variety of Megalichthys. 



Position and locality : Rag mine and Deep mine iron- 

 stones, Fenton and Longton. 



