OF FOSSIL FISHES FROM THE COAL-MEASURES. 



429 



This specimen is evidently closely related to the two species already 

 described from the Cannel Coal, though it varies somewhat in form. 

 It is larger and stronger in appearance ; as compared with the others 

 it is very broad towards the base, and contracts in diameter more 

 rapidly to the point. It is oval in section, in this particular resembling 

 A. obtusus, whilst it differs from A. acutus, which is round ; all the 

 three agree in being straight, ending in a more or less pointed apex, 

 and in the absence of denticles. The spines are of the same dense 

 structure in each ; and the form of the internal cavity appears to be 

 similar. In reference to its tapering form, I suggest the specific 

 name fastigiatus. 



Locality. Blackband Ironstone at Loanhead, in the Middle Lime- 

 stone series near Edinburgh. The specimen has been sent to me by 

 Mr. W. Tait Kinnear of that city. 



EXPLANATION OF PLATE XXII. figs. 10-12. 



Figs. 10, 10 a. Anodontacanthus acutus, Davis. 

 Fig. 106. Transverse section. 



11. Anodontacanthus obtusus, Davis. 



11 a. Transverse section. 



12. Anodontacanthus fastigiatus, Davis. 



12 a. Transverse section, 



