ICHTHT0D0KT7L1TES. 
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. yoI. i. p. 168. 
1848. Gyracanthus sp., R. Ilowse, 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. Guracanthus formosus, J. Ward, [Proc.l 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 tuberculatus , 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. Fnknown, 
The type species. 
Form. 4' Toe. Coal-Measures 1 : 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. 
