306 
SELACHII. 
Hybodus fittoni , W. Dunker, Nordd. Wealdenbild. (1846), p. 67, 
pi. xiii. fig. 34.—Wealden ; N. Germany. 
Hybodus furcatostriatus , K. Martin, Zeitschr. dentsch. geol. Ges. 
vol. xxvi. (1874), p. 819, pi. xxix. figs. 3, 4.—Rhaetic; 
Hildesheim, Hanover. 
Hi/bodus hexaqonus , G. von Munster, op. cit. iv. (1841), p. 141, 
pl. xvi. fig. 16.—Inas; S.E. Ty r oh^ 
Hybodus loeviusculus, L. Agassiz, tom. cit. p. 46, pl. x. figs. 24-26 
(?) H. von Meyer & T. Plieninger, Beitr. Pal. Wiirttembergs ^ 
(1844), p. 108, pl. xii. fig. 67.—RhaTic ; Aiist Cliff, 
Bristol, and (?) Wiirtemberg. [? Nemacanthus.) 
Hybodus leptodus , L. Agassiz, tom. cit. p. 44, pl. x. figs. 2, 3.— 
Form, and loc. unknown. 
Hybodus pleiodus, L. Agassiz, tom. cit. p. 45, pl. x. figs. 13-17.— 
Form, and loc. unknown. 
Hybodus punctatus , J. W. Davis, Quart. Journ. Geol. Soc. vol. 
xxxvii. (1881), p. 417, pl. xxii. fig. 2.—Rkaetic; Aust 
Cliff, Bristol. ? 
j —— 5 j 
Leicicanthus falcatus, L. Agassiz, tom. cit. p. 55, pl. viii. b. fig. 16. 
—Muschelkalk; Luneville, E. France. 
Leiacanthus ( Hybodus ) opatowitzanus, H. von Meyer, Palaeontogr. 
vol. i. (1849), p. 221, pl. xxx. fig. 1.—Muschelkalk; 
Silesia. 
Leiacanthus {Hybodus) tarnowitzanus , H. von Meyer, tom. cit. 
p. 221, pl. xxx. fig. 2.—Muschelkalk; Silesia. 
The so-called Hybodus pancleri (E. von Eiehwald, Leth. Rossica, 
vol. i. 1860, p. 1603), from the Carboniferous Limestone of the 
Government of Toula, Russia, is founded upon a spine probably of 
Ctenacanthus. 
A small cephalic dermal spine {Sphenonchus) from the Trias of 
Wiirtemberg, now in the Stuttgart Museum, is named Ceratodus 
heteromorplius , L. Agassiz, Poiss. Foss. vol. iii. (1838), p. 136, 
pl. xviii. fig. 32. Other spines are figured under the same name by 
F. A. Quenstedt, Handb. Petrefakt., 3rd edit. (1883), p. 298, pl. 
xxiv. figs. 9-13. 
spec, Some similar spines from the RhaBtic Bone-bed of Aust Cliff, near 
Bristol, are named Sphenonchus {Hybodus) obtusus , J. W. Davis, 
" Quart. Journ. Geol. Soc. vol. xxxvii. (1881), p. 420, pl. xxii. fig. 7. 
See also T. Webster, Trans. Geol. Soc. [2] vol. ii. p. 35, pl. vi. 
fig. 8 (“ Tooth of fish ”), where a Wealden example is noticed. 
“ Sphe 1 lonchus ,, is also recorded from the Lias of Weston, near 
Bath (Mag. Rat. Hist. n. s. vol. iii. p. 282), and the Wealden of 
Sandown, Isle of Wight {ibid. p. 279). 
