On the Fossil Fishes of the Carboniferous Limestone Series of Great Britain. 365 
spine, curved directly backwards, the sides marked with strong, smooth, longitudinal 
ridges, and having two rows of short, downward-curved teeth on the posterior con- 
cave margin ; thirdly, a peculiar prop-like portion extending directly forward nearly 
at right angles with the base, gently arched downwards, compressed at the basal half, 
depressed at the distal half, closely covered with blunt, smooth, oval tubercles, and 
with some large irregular spines on the under side ; the portion of the base above 
the flesh, and from which these two portions branch, is irregularly tuberculated.” 
—(M‘Coy.) The anterior portion of the spine terminates in an enlarged process 
studded with four or five terminal tubercles of larger size than on any other portion 
of its surface. 
This very peculiar ichthyodorulite was first named by Prof. Agassiz and recorded 
without description in the “ Poissons Fossiles.” The specimens were in the collection 
of the Earl of Enniskillen, at Florence Court, where they have remained to the present 
time. Prof. M‘Coy afterwards described specimens of the same genus and species, 
which he found in the collection of Capt. Jones, R.N.,in the “British Palzeozoic Fossils” 
as Hrismacanthus jonesii. Priority being generally accepted as the guide in the 
retention of synonymical names, in the present instance the generic name of Agassiz, 
viz., Cladacanthus, must be adhered to. 
Cladacanthus paradoxus, Agass. (indet.) 
(Pl. XLVIL., figs. 1-5.) 
Cladacanthus paradoxus—L. Agassiz, 1837. “ Rech. sur 1. Poiss. Foss.” Vol. III., p. 176 (indet). 
9p % C. G. Giebel, 1848. ‘Fauna der Vorwelt,” Vol. I., pt. 3, p. 310. 
55 % H. G. Bronn, 1848. ‘ Nomencl. Paleont.,” p. 303. 
Krismacanthus jonesii— F. M‘Coy, 1848. ‘Ann. & Mag. Nat. Hist.,” 2nd ser., Vol. IT., p.119. 
Dipriacanthus faleatus— 3 1848. s 55 5 gp Zacher WOOL jo, A 
Cladacanthus paradoxus—H. G. Bronn, 1849. “ Enumerator Paleont.,” p. 653. 
3 y J. Morris, 1854. ‘Catal. Brit. Foss.,” p. 321. 
Dipriacanthus faleatus— - 1854. ss “3 . p- 3209. 
Erismacanthus jonesii— on 1854. es *) * p» 326, 
5 - F. J. Pictet, 1854. “Traité de Paléont.,” Vol. II., p. 293. 
Dipriacanthus falcatus— % 1854. e 5 op Viol lS py 292) 
Erismacanthus jonesii— __F. M‘Coy, 1855. “ Brit, Paleoz. Foss.,” p. 628, pl. 3 K, figs. 26, 27. 
Cladacanthus paradoxus—Morris & Roberts, 1862. “Quart. Journ. Geol. Soc.,” Vol. XVIIL., p. 100. 
Dipriacanthus faleatus— _,, % 1862. .. 55 e > WoL 2zQVINNL 7 OO, 
Erismacanthus jonesii— rs 1862. s . 3 is Vol. XVIII, p. 100. 
5) % St. John & Worthen, 1875. “ Paleont. of Illinois,” Vol. VL, p. 463. 
Cladacanthus paradoxus—J. J. Bigsby, 1878. ‘Thesaurus Devon.-Carbonif.,” p. 349. 
Dipriacanthus falcatus— is 1878. <A ¥ 9 p. 355, 
Erismacanthus jonesii— ss 1878. 99 » ” p.,355. 
\ 
The following description of this spine is taken from the admirable one given by 
Prof. M‘Coy, with some modifications rendered necessary by the observation of a 
large suite of specimens in the Enniskillen and other collections. 
