ICnTHTODORULIIES. 147 
1855. Erismacantkus jonesii, F. M‘Coy, Brit. Palseoz. Foss. p. 628, 
pi. iii. k. figs. 26, 27. 
1883. Cladacanthus paradoxus , J. W. Davis, Trans. Roy. Dublin Soc. 
[2] vol. i. p. 365, pi. xlvii. figs. 1-5. [ Glim 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. fy Loc. Lower Carboniferous Limestone : Armagh. Yore- 
dale Rocks: Yorkshire. 
P. 2895-6. Six broken spines, and seven examples of the branches; 
Armagh. EnnisJcillen Coll. 
P. 2897. Two examples of the longer branch of the spine, displaying 
large terminal tubercles ; Armagh. EnnisJcillen Coll. 
Hrismacanthus 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. > EnnisJcillen 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 unJcnown. 
The following species has also been described :— 
E) ismacanthus maccoyanus , St. John & Y orthen, 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. EnnisJcillen Coll.), 
which may possibly be the long branch of a distinct form of spine 
l 2 
