748 Davis — O71 the Fossil Fish-Remains of the Coal Measures of the British Islands. 



The genus is confined to two species from the Cannel Coal of Tingley, in 

 Yorkshire. A single specimen described as a third species, A. fastigiatiis* from 

 tlie Blackband Ironstone at Loanhead, in the Carboniferous Limestone series, 

 near Edinburgh, is considered by Dr. Traquair, who has other specimens, to 

 belong to another genus, and awaits his further elucidation. 



Anodontacauth.us acutus, Davis. 



(PL Lxxm., fig. 25.) 



Anodontacanthus acutus, . Davis, J. W., 1881, " Quart. Journ. Geol. Soc," 



vol. xxxvii., p. 428, pi. xxii., fig. 10. 



Spine: length, 0-6 m.; breadth, 0-05 m., gradually tapering to a point; 



straight, circular in section, with an internal cavity occupying one-half the 



diameter of the spine in the middle of its length ; towards the base the walls 



become thinner ; orifice terminal. There are no lateral denticles. 



• 



Formation and Locality. — Cannel Coal, Tingley. 



Ex coll. — James W. Davis, Halifax. 



Anodontacantlius obtusus, Davis. 



(PI. LXxm., fig. 26). 



Anodontacanthus obtusus, . Davis, J. W., 1881, "Quart. Journ. Geol. Soc," 



vol. xxxvii., p. 248, pi. xxii., fig. 11. 



Spine : larger than the preceding one, probably 0-9 m. in length and propor- 

 tionately thick; oval in section, with the internal cavity much smaller than in 

 A. acutus ; distal extremity obtusely flattened and circular. 



Formation and Locality. — Cannel Coal, Tingley. 



Ex coll. — James W. Davis, Halifax. 



* Quart. Journ. Geol. Soc, vol. xxxvii., p. 428. 1881. 



