﻿102 u'-irrnYonoRULiTES. 



Ctenacanthus (?) laevis, Davis. 

 L883. Ctenacanthus tevis, J. W. Davis, Trans. Roy. Dublin Soc. [2] 

 vol. i. p. 341, pi. xlv. fig. 1. 



Type. Bristol Museum. 



This species may pertain to Acondylacanthus. 



Form. 4' Loc. Lower Carboniferous Limestone : Armagh. 



P. 2531. Type specimen. Ennishillen Coll. 



P. 2532-3, P. 2873. Three imperfect spines. Enniskillen Coll. 



39166. Much crushed imperfect spine. Bowerhank Coll. 



Ctenacanthus (?) pustulatus, Davis. 

 1883. Ctenacanthus pustulatus, J. W. Davis, Trans. Roy. Dublin Soc. 

 [2] vol. i. p. 344, pi. xlv. fig. 2. 



Type. British Museum. 



This species may pertain to Aster optychius. 



Form. Sf Log. Lower Carboniferous Limestone : Armagh. 



P. 2529. Type specimen. EnnisTcillen Coll. 



The following species have also been described, but there are no 

 examples in the Collection : — 



Ctenacanthus angulatus, Newberry & Worthen, Pal. Illinois, 



vol. ii. (1866), p. 118, pi. xii. fig. 4. — Chester Limestone ; 



Illinois. 

 Ctenacanthus angustus, J. S. Newberry, Palaeoz. Fishes N. America 



(Mon.U.S. Geol. Surv. no. xvi. 1889), p. 181.— Berea Grit 



(Lower Carboniferous) ; Berea, Ohio. 

 Ctenacanthus burlingtonensis, St. John & Worthen, Pal. Illinois, 



vol. vi. (1875), p. 426, pi. xv. figs. 6, 7. — Upper Burlington 



Limestone ; Illinois and Iowa. [? Acondylacanthus.] 

 Ctenacanthus buttersi, St. John & "Worthen, op. cit. vol. vii. (1883), 



p. 240, pi. xxii. fig. 2. — Lower Coal-Measures ; Illinois. 

 Ctenacanthus cannaliratus, St. John & Worthen, op. cit. vol. vii. 



p. 239, pi. xxi. fig. 3. — Chester Limestone ; Illinois. 

 Ctenacanthus clarhi, J. S. NewBerry, Palseoz. Fishes N. America 



(Mon. U.S. Geol. Surv. no. xvi. 1889), p. 168, pi. xxvi. 



figs. 2, 3. — Cleveland Shale (Lower Carboniferous ) ; Berea, 



Ohio. [Columbia College, New York.] 



