J+r-? sT / v f r-if r 
2 -) 
M 
150 
pe 
T p 
( \* £ ' 
1CHTIITODOEULITE3. 
(1837), p. 7, pi. i. figs. 3-5.—Old Red Sandstone ; Brom- 
./ “ yard, Herefordshire. [? Cephalaspidian cornua.] 
Byssacanthus gosseleti, C. Barrois, Ann. Soc. Geol. du Hord, yoI. ii, 
(1875), p. 200, and Comptes Rendus Assoc. Erang. 1874, 
p. 381.-—Upper Devonian ; Couvin, Ardennes. 
Byssacanthus Icevis, L. Agassiz, Poiss, Boss. Y. G. R. (1845), 
£ PP* HI? 117, pi. sxxiii. fig. 15 : Byssacanthus clilatatus , 
7r» f a von Eichwald, Leth. Rossica, vol. i. (1860), p. 1598 : 
. U/t4*'T*+f**' Byssacanthus ( Onchus ) clilatatus , E. von Eichwald, Bull. 
Soc. Imp. Hat. Moscou, vol. xix. (1846), p. 288, pi. x. 
U, v, i/'* HP* .. 2, 3.—Devonian; St. Petersburg. £}'&*** 
, Uoj^ob^^Z: ~r . . . w / 
v 1 ^ spine from the Upper Silurian of the Baltic Provinces, ex- 
& hibiting considerable resemblance to Byssacanthus , is named Babda- 
• canthus truncatus , C. H. Pander, Eoss. Eische Silur. Syst. russ.- 
^ bait. Gouvernements (1856), p. 69, pi. vi. fig. 26. 
l V?f The following genera also seem to belong to this group of Ich- 
V' 
b « 
% - 
i. 
4 • 
A* 
thyodorulites:— 
Cyrtacanthus , J. S. Hewberry (Rep. Geol. Surv. Ohio, vol. i. pt. ii. 
1873, p. 306), with the single species, (7. dentcitus , Hewberry, i&fdk 
p. 307, pi. xxix. fig. 5.^/ [Doubtfully assigned to Erismacanthus 
(“ Cladacanthus ”) by J. S. Hewberry, Pakeoz. Eishes H. America 
(Hon. U.S. Geol. Surv. no. xvi. 1889), p. 29.]—Corniferous Lime¬ 
stone (Lower Devonian); Delaware; Ohio. [Columbia College, 
Hew York.] 
Euacanthus , H. Trautschold (Bull. Soc. Imp. Hat. Moscou, 1883, 
gp pt. ii. p. 171), with the single species, E. margaritatus , Traut¬ 
schold, ibicl. p. 172, pi. v. figs. 7-13.—Carboniferous Limestone; 
Moscow. [Trautschold Collection, Breslau.] 
Harpaccinthus, R. H. Traquair (Ann. Mag. Hat. Hist. [5] 
vol. xviii. 1886, p. 493), with the single species, H. fimbnatus, 
Traquair (ibid. p. 493, woodcut), previously named Tristychius 
Jimbriatus, T. Stock (Ann. Mag. Hat. Hist. [5] vol. xii. 1883, p. 177, 
pi. vii. fig. 1).—Middle Carboniferous Limestone; Gilmerton, 
near Edinburgh. [Edinburgh Museum.] Also St. Louis Limestone 
(Lower Carboniferous) ; Alton, Illinois h 
Ostracacanthus , J. AY. Davis (Rep. Brit. Assoc. 1879, p. 343, and 
Quart. Journ. Geol. Soc. vol. xxxvi. 1880, p. 64), wnth the single 
species, O. dilatatus , Davis, ibid. 1879, p. 343, and ibid. 1880, 
p. 64, woodcut.—Cannel Coal (Middle Coal-Measures); Tingley, 
Yorkshire. [Collection of J. AY. Davis, Esq., Halifax.] 
1 J. S. Newberry, Palaeoz. Fislies N. America (Mon. U.S. Geol. Surv. no. xvi. 
1889), p. -03, pi. xxi. fig. 11. 
