ACANTHODIDJE. 
15 
A mass of scales, of indeterminable genus, from the Genesee 
Shale (Upper Devonian), Glenville, Hew York, is named Acanthocles ? 
pristis , J. M. Clarke, Bull. U.S. Geol. Surv. no. 16 (1885), p. 42. 
Genus ACANTHODOPSIS, Hancock & Atthey. 
[Ann. Mag. Hat. Hist. [4] vol. i. 1868, p. 364.] 
[Form of trunk and arrangement of fins unknown.] Dentition 
powerful, consisting of few large, laterally compressed, triangular 
teeth. Pectoral fin-spines relatively large. 
This genus was originally founded upon some portions of jaws 
from the Coal-Measures of Horthumberland, met with in association 
with pectoral fin-spines and shagreen, indistinguishable from the 
corresponding parts of Acanthocles wardi. The fish just mentioned 
was thus regarded as the type species of the genus, while a supposed 
second form, of larger size, received the name of Acanthodopsis 
egertoni. 
Acanthodopsis wardi, Hancock & Atthey. 
1868. Acanthodopsis ivardi, Hancock & Atthey, Ann. Mag. Hat. Hist. 
[4] vol. i. p. 364, pi. xv. fig. 6 (reprinted in Hat. Hist. Trans. 
Horthumb. & Durham, vol. iii. 1870, p. 103, pi. ii. fig. 6). 
1868-70. Acanthodopsis egertoni , Hancock & Atthey, ibid. p. 367, and 
ibid. p. 107. [Jaw; Hewcastle-upon-Tyne Museum.] 
1880. Acanthodopsis, R. H. Traquair, Proc. Roy. Phys. Soc. Edinb. 
vol. v. p. 117. 
1890. Acanthodopsis wardi, R. H. Traquair, Proc. Roy. Soc. Edinb. 
vol. xxvii. p. 388. 
Type. Jaws, &c.; Hewcastle-upon-Tyne Museum. 
The type species, having jaws attaining a length of about 0-5. 
Teeth at least as broad as deep, marked with fine vertical wrinkles, 
and confluent at the base ; about six or eight in number on each 
side above and below, largest in the middle of the ramus, and 
without intermediate denticles. Pectoral spines long and laterally 
compressed, smooth, with an antero-lateral longitudinal groove. 
Dermal granules smooth. 
Form. Sf Log. Coal-Measures : Horthumberland and Midlothian. 
41202. Portion of jaw with two teeth; Low Main Seam, Hewsham, 
near Hewcastle. Presented by T. P. Barkas , Esq., 1868. 
P. 786-7. Three fragments of jaws, one also showing the proximal 
end of a ceratohyal: Hewsham. Egerton Coll. 
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