﻿ACANTHODIDJE. 



15 



A mass of scales, of indeterminable genus, from the Genesee 

 Shale (Upper Devonian), Glenville, New York, is named Acanthodes 1 ? 

 prists J. M. Clarke, Bull. U.S. Geol. Surv. no. 16 (1885), p. 42. 



Genus ACANTHODOPSIS, Hancock & Atthey. 

 [Ann. Mag. Nat. 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 Northumberland, met with in association 

 with pectoral fin-spines and shagreen, indistinguishable from the 

 corresponding parts of Acaniliodes 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 wardi, Hancock & Atthey, Ann. Mag. Nat. Hist. 



[4] vol. i. p. 364, pi. xv. fig. 6 (reprinted in Nat. Hist. Trans. 



Northumb. & Durham, vol. iii. 1870, p. 103, pi. ii. fig. 6). 

 1868-70. Acanthodopsis egertoni, Hancock & Atthey, ibid. p. 367, and 



ibid. p. 107. [Jaw ; Newcastle-upon-Tyne Museum.] 

 1880. Acanthodopsis, R. H. Traquair, Proc. Roy. Phys. Soc. Edinb. 



vol. v. p. 117. 

 1890. Acanthodopsis wardi, P. H. Traquair, Proc. Roy. Soc. Edinb. 



vol. xxvii. p. 388. 



Type. Jaws, &c. ; Newcastle-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 Loc. Coal-Measures : Northumberland and Midlothian. 



41202. Portion of jaw with two teeth; Low Main Seam, Newsham, 

 near Newcastle. Presented by T. P. Barkas, Esq., 1868. 



P. 786-7. Three fragments of jaws, one also showing the proximal 

 end of a ceratohyal ; Newsham. Egerton Coll. 



