﻿ICHTHY0D0KUL1TES. 141 



1837. Gyracanthus tuberculatus, L. Agassiz, ibid. p. 19, pi. i.a. figs. 1-7. 

 1841. Gyracanthus formosus, E. W. Binney, Trans. Manchester Geol. 



Soc. vol. i. p. 168. 

 1848. Gyracanthus sp., R. Howse, Trans. Tyneside Nat. Field Club, 



vol. i. p. 237 (assigned to G. formosus by W. King, Permian 



Fossils, 1850, p. 221). 



1867. Mitrodus quadricornis, R. Owen, Trans. Odontol. Soc. vol. v. 

 p. 338, pi. iii. [Micro, section of dermal tubercle; British 

 Museum.] 



1868. Gyracanthus tuberculatus, Hancock & Atthey, Ann. Mag. Nat. 

 Hist. [4] vol. i. p. 368. 



1872. Gyracanthus tuberculatus, Hancock & Atthey, ibid. vol. ix. p. 260. 

 1870-72. Gyracanthus tuberculatus, Hancock & Atthey, Nat. Hist. 



Trans. Northumb. and Durham, vol. iii. p. 108, and vol. iv. p. 421. 



1873. Gyracanthus, T. P. Barkas, Coal Meas. Palseont. p. 15, figs. 1-5. 

 1875. Gyracanthus formosus, J. Ward, [Proc] N. Staffs. Nat. Field 



Club, p. 216, fig. 3. 



1875. Gyracanthus tuberculatus, J. Ward, ibid. p. 217. 



1876. Gyracanthus tuberculatus, J. W. Davis, Quart. Journ. Geol. Soc. 

 vol. xxxii. p. 334. 



1883. Gyracanthus tuber cidatus, T. Stock, Ann. Mag. Nat. Hist. [5] 

 vol. xii. p. 185, pi. vii. fig. 17 (dermal tubercle). 



1884. Gyracanthus formosus, R. H. Traquair, Ann. Mag. Nat. Hist. 

 [5] vol. xiii. p. 46. 



1890. Gyracanthus tuberculatus, J. Ward, Trans. N. Staffs. Inst. 

 Mining Engineers, vol. x. p. 150 ; pi. iii. fig. 1. 



Type. Unknown. 

 The type species. 



Form. Sf Loo. Coal-Measures ! : English and Scottish Coal-fields, 

 and Kilkenny and Queen's Co., Ireland. 



Unless stated, the precise horizon of the following specimens is 

 unrecorded : — 



P. 5240. Portion of large spine; Dudley, South Staffordshire. 



Purchased, 1886. 



P. 5242. Yery small spine ; Knowles Shale, Fenton Park, North 

 Staffordshire. Purchased, 1886. 



P. 1184. Abraded fragment ; Cannel Coal (Middle Coal-Measures), 

 Tingley, Yorkshire. 



Presented by the Earl of Enniskillen, 1882. 



1 The impression of the base of a fin-spine in the Newcastle Museum, re- 

 corded by Howse (1848) as obtained from the Lower Permian of Westoe, is 

 now regarded by that author as truly an Upper Carboniferous fossil. 



