1c4 BRITISH FOSSIL VERTEBRATA. 
HYBODUS (continiucd)— 
? Sp., A. S. Woodward, Cat. Foss. Fishes B. M., pt. i, 1889, p. 277. 
Loc. Chalk; S.E. England. [Group of teeth; Brit. Mus., 
no. 45311.] 
s)-, J. Morris, Cat. Brit. Foss., 1854, p. 339. (? Sywechodus.) 
HY PSOCORMUS, A. Wagner, Abh. k. bay. Akad. Wiss., Cl. ii, 
vol. ix, 1863, p. 677. 
leedsi, A. S. Woodward, Geol. Mag. [3] vol. vi, 1889, p. 450, and 
Rep. Brit. Assoc., 18809. 
Loc. Oxford Clay; Peterborough. [Jaws; A. N. Leeds Coll.] 
tenuirostris, A. S. Woodward, zd7d., p. 451, and 7did. 
Loc. Oxford Clay ; Peterborough. [Jaws ; A. N. Leeds Coll.] 
sp., A. S. Woodward, Geol. Mag. [3] vol. vi, 1889, p. 451. 
Loc. Kim, Clay ; Weymouth. [Portions of jaws ; Brit. Mus., 
no. 42368. } 
HY PSODON, Agassiz. v. Pachyrhizodus and Portheus. 
lewesiensis, Agassiz. wv. Cladocyclus lewesiensis, Pachyrhizodus 
gardneri, Portheus mantelli, and Portheus sp. 
minor, Dixon. wv. Ichthyodectes minor. 
oblongus, L. Agassiz, Poiss. Foss., vol. v, pt. i (1843), p. 10% 
(name only). 
Loc. London Clay ; Sheppey. 
toliapicus, L. Agassiz, Poiss. Foss., vol. v, pt. i (1843), p. 101 
(name only.) 
Loc. London Clay; Sheppey. [Imperfect cranium; Brit. Mus.] 
ICHTHYODECTSES, E. D. Cope, Proc. Amer. Phil. Soc., vol. xi 
(1871), p. 536. 
elegans, E. T. Newton, Quart. Journ. Geol. Soc., vol. xxxiii, 
1877, p. 521, pl. xxii, f. 15. 
Loc. L. Chalk ; Dorking, Surrey. [Jaw; Brit. Mus.] 
minor, FE. T. Newton, zdid., p. 520, pl. xxii, f. 14. 
Hypsodon minor, ¥. Dixon, Geol. Sussex, 1850, descr. to pl. 
xxxil*, f. 9 (name and fig. only). 
Loc. Chalk; Sussex. [Jaw; Brit. Mus.] 
Ichthyolithus clackmannensis, Fleming. v. Megalichthys 
hibberti. 
ICTINOCEPHALUS, Page. wv. Ischnacanthus. 
granulatus, Page. v. Ischnacanthus gracilis. 
ISCHNACANTHUS, J. Powrie, Quart. Journ. Geol. Soc., vol. xx, 
1864, p. 419. 
ICTINOCEPHALUS, D. Page, Rep. Brit. Assoc. 1858 (1859), 
Sect., p. 105. 
