﻿ICnTHYODORULITBS. 147 



1855. Erismacanthus jonesii, F. M'Coy, Brit. Palaeoz. Foss. p. 628, 

 pi. iii. k. figs. 20, 27. 



1883. Cladacanthus paradoxus, J. W. Davis, Trans. Roy. Dublin Soc. 

 [2] vol. i. p. 365, pi. xlvii. figs. 1-5. [Olim Enniskillen Coll. 

 See Introduction.] 



1884. Cladacanthus paradoxus, J. W. Davis, Quart. Journ. Geol. Soc. 

 vol. xl. p. 617, pi. xxvi. figs. 1-5. 



Type. "Woodwardian Museum, Cambridge. 

 The type species. 



Form. <5f Loc. Lower Carboniferous Limestone : Armagh. Yore- 

 dale Rocks : Yorkshire. 



P. 2895-6. Six broken spines, and seven examples of the branches; 

 Armagh. Enniskilltn Coll. 



P. 2897. Two examples of the longer branch of the spine, displaying 

 large terminal tubercles ; Armagh. Enniskillen Coll. 



Erismacanthus major (Davis). 



1883. Cladacanthus major, J. W. Davis, Trans. Roy. Dublin Soc. [2] 

 vol. i. p. 366, pi. xlvii. figs. 6, 7. 



Type. Formerly in the Enniskillen Collection (see Introduction). 

 Form. Sf Loc. Lower Carboniferous Limestone : Armagh. 



P. 2898-9. Five imperfect specimens of the pointed branch of the 

 spine. Enniskillen Coll. 



The following specimen is supposed to have been obtained from 

 the Lower Carboniferous Limestone of Bristol : — 



P. 6257. The arched portion of a spine as large as E. major. The 

 keel on the convex margin is very broad, and the denticles 

 on the opposite margin large, broad, and closely arranged ; 

 the sides are ornamented with fine longitudinal ridges, 

 with a few small tubercles near the base. 



History unknown. 



The following species has also been described : — 



Erismacanthus maccoyanus, St. John & Worthen, Pal. Illinois, 

 vol. vi. (1875), p. 461, pi. xxii. figs. 1-5. — St. Louis 

 Limestone ; Illinois and Missouri, U.S.A. 



There is also a single specimen in the Collection from the Lower 

 Carboniferous Limestone of Armagh (P. 2896. Enniskillen Coll.), 

 which may possibly be the long branch of a distinct form of spine 



l2 



