PISCES. 185 
SPHENACANTHUS, L. Agassiz, Poiss. Foss., vol. iii (1837), 
p- 23. 
sequistriatus (Davis), A. S. Woodward, Cat. Foss. Fishes B.M., 
pt. 1, 1889, p. 244. 
Ctenacanthus eguistriatus, J. W. Davis, Quart. Journ. Geol. Soc., 
vol. xxxv, 1879, p. 185, pl. x, f. 15. 
Loc. L. Coal-Meas. ; Yorkshire. [Spine ; J. W. Davis Coll.] 
costellatus (Traquair), A. S. Woodward, Cat. Foss. Fishes 
B. M., pt. 1, 1889, p. 242. 
Ctenacanthus costellatus, R. H. Traquair, Geol. Mag. [3] vol. i, 
1884, p. 3, pl. ii, and zézd., vol. v, 1888, p. 81. 
Loc. Calcif. Sandst.; Eskdale, Dumfriesshire. [Fish; Brit. 
Mus.] 
hybodoides (Egerton), A. S. Woodward, Cat. Foss. Fishes B. M., 
pt. i, 1889, p. 242; J. Ward, Trans. N. Staffs. Inst. Mining 
Engin., vol. x (1889), pl. ili, f. 2. 
Ctenacanthus hybodotdes, P. M. G. Egerton, Quart. Journ. Geol. 
Nat. Field Club, 1875, p. 215; J. W. Davis, Quart. Journ. 
Geol. Soc., vol. xxxii, 1876, p. 335. 
Ctenacanthus nodosus, P. M. G. Egerton, Quart. Journ. Geol. 
Soc., vol. ix, 1853, p. 281; J. Morris, Cat. Brit. Foss., 1854, 
p- 323. [Spine; Brit. Mus.] 
Ctenacanthus major, J. Thomson (zon Agassiz), Rep. Brit. 
Assoc., 1869 (1870), Sect., p. 102. 
Cladodus elegans, T. P. Barkas, English Mechanic, vol. xii 
| (1871), p. 403, woodcut. [Tooth.] 
Ctenacanthus (?and Cladodus), T. P. Barkas, Coal Meas. 
Palzont., 1873, p. 21, f. 43-58 (? p. 19, f. 31-34). 
Hybodus, W. J. Barkas, Geol. Mag. [2] vol. i, 1874, p. 163, and 
) Proc. Roy. Soc. N. S. Wales, vol. xi (1878), p. 145. 
? Hybodus davist, W.J. Barkas, Monthly Rev. Dental Surgery, 
vol. vii, 1878, p. 193. [Tooth; J. W. Davis Coll.] 
Loc. Coal-Meas. ; South Scotland, Northumberland, Yorkshire, 
Derbyshire, Staffordshire, and North Wales. [Spine ; Brit. 
Mus.]} 
minor (Davis), A. S. Woodward, Cat. Foss. Fishes B. M., pt. i, 
1889, p. 244. 
Ctenacanthus minor, J. W. Davis, Geol. Mag. [2] vol. vi, 1879, 
p- 531, woodcut. 
Loc. L. Coal-Meas. (Black-bed Coal); Dudley Hill, near 
Bradford, Yorkshire. [Spine ; Bradford Mus.] 
serrulatus, L. Agassiz, Poiss. Foss., vol. iii (1837), p. 24, pl. |, 
f. 11-13 ; J. Morris, Cat. Brit. Foss., 1854, p. 344; A. 5S. 
Woodward, Cat. Foss. Fishes B. M., pt. i, 1889, p. 242. 
