ICHTHY0D0RUL1TES. 
145 
Gyracanthus inornatus, J. S. Newberry, Palasoz. Fishes N. 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, Rep. Geol. Surv. Ohio, vol. ii. pt. ii. 
(1875), p. 57.—Lower Carboniferous Limestone ; Cape 
Breton. [Halifax Museum, Nova Scotia.] 
Gyracanthus nobilis, R. H. Traquair, Geol. Mag. [2] vol. x. (1883), 
p. 542, and Ann. Mag. Nat. Hist. [5] vol. xiii. (1884), 
p. 44 : G. tubercidcitus, R. H. Traquair (non Agassiz), 
Geol. Mag. [2] vol. viii. (1881), p. 34.—Middle Carboni¬ 
ferous Limestone ; Edinburgh and Fifeshire. [Collection 
of Dr. R. H. Traquair.] 
Gyracanthus obliquus , F. M‘Cov, Ann. Mag. Nat. Hist. [2] vol. ii. 
(1848), p. 117, and Brit. Palseoz. Foss. (1855), p. 629, 
pi. iii. x. figs. 13,14.—Lower Carboniferous ; Moyheeland, 
near Draperstown, Ireland. [Woodwardian Museum, 
Cambridge.] 
Gyracanthus sherwoocli, J. S. Newberry, Palgeoz. Fishes N. America 
(Mon. TJ.S. Geol. Surv. no. xvi. 1889), p. 119, pi. xviii. 
fig. 4.—Catskill Group ; Pennsylvania. [Columbia College, 
New York.] 
Gyracanthus youngi , R. 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. R. H. Traquair.] 
Gyracanthus ornatus , Agassiz (Poiss. Foss. vol. iii. p. 177), from 
the Welsh Coal-Measures, is named only, and G. cdnwicensis , 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. ? corclatus , 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 
PART II, 
L 
