﻿ICHTHYODORTJLlTES. 1 45 



Gyracanthus inornatus, J. S. Newberry, Palaeoz. Fishes K America 

 (Mon. U. S. Geol. Surv. no. xvi. 1889), p. 177, pi. xxiii. 

 fig. 5. — Waverly Group ; Wayne Co., Ohio. [Columbia 

 College, New York.] 



Gyracanthus magnificus, J. W. Dawson, op. cit. 2nd edit. p. 210 ; 

 J". S. Newberry, Bep. Geol. Surv. Ohio, vol. ii. pt. ii. 

 (1875), p. 57. — Lower Carboniferous Limestone ; Cape 

 Breton. [Halifax Museum, Nova Scotia. J 



Gyracanthus nobilis, E. H. Traquair, Geol. Mag. [2] vol. x. (1883), 

 p. 542, and Ann. Mag. Nat, Hist. [5] vol. xiii. (1884), 

 p. 44 : G. tubercidatus, B. H. Traquair (non Agassiz), 

 Geol. Mag. [2] vol. viii. (1881), p. 34.— Middle Carboni- 

 ferous Limestone ; Edinburgh and Fifeshire. [Collection 

 of Dr. 11. H. Traquair.] 



Gyracanthus obliquus, F. M'Coy, Ann. Mag. Nat. Hist. [2] vol. ii. 

 (1848), p. 117, and Brit, Pakeoz. Foss. (1855), p. 629, 

 pi. iii. e. figs. 13, 14. — Lower Carboniferous ; Moyheeland, 

 near Draperstown, Ireland. [Woodwardian Museum, 

 Cambridge.] 



Gyracanthus sherwoodi, J. S. Newberry, Palaeoz. Fishes N. America 

 (Mon. U.S. Geol. Surv. no. xvi. 1889), p. 119, pi. xviii. 

 fig. 4. — Catskill Group ; Pennsylvania. [Columbia College, 

 New York.] 



Gyracanthus youngi, B. H. Traquair, Geol. Mag. [2] vol. x. 

 (1883), p. 543, and Ann. Mag. Nat. Hist, [5] vol. xiii. 

 (1884), p. 47. — Middle Carboniferous Limestone ; Scottish 

 Coalfield. [Collection of Dr. B. H. Traquair.] 



Gyracanthus ornatus, Agassiz (Poiss. Foss. vol. iii. p. 177), from 

 the Welsh Coal-Measures, is named only, and G. almuicensis, Agassiz 

 (ibid. p. 19, pi. i. a. fig. 8), from the Carboniferous Limestone of 

 Alnwick, Northumberland, is too imperfectly defined for recogni- 

 tion. The so-called G. ? cordatus, St. John & Worthen (Pal. Illinois, 

 vol. vii. 1883, p. 251, pi. xxvi. fig. 4), from the Keokuk Limestone 

 of Iowa, does not belong to this genus. 



The American pectoral spines of Gyracanthus are more laterally 

 compressed than any yet known in Europe. 



Genus AGANACANTHUS, Traquair. 

 [Geol. Mag. [3] vol. i. 1884, p. 64.] 



Paired spines resembling the fin-spines of Gyracanthus in shape, 

 but relatively shorter and stouter, and destitute of any superficial 

 PARI ii. . l 



