i REPTILIA. 25% 
NUTHETES, R. Owen, ()uart. Journ. Geol. Soc., vol. x, 1854, p. 420; 
R. Lydekker, Cat. Foss. Rept. B. M., pt. i, 1888, p. 247. 
destructor, R. Owen, Quart. Journ. Geol. Soc., vol. x, 1854, 
p- 420, woodcuts 1-4, and Rept. Weald. and Purb. Form., 
pt. v (Pal. Soc., 1861), p. 31, and zzd., Suppl. ix (Pal. Soc., 
1879), p. 16, pl. ii, f. 13-23, and Journ. R. Micros. Soc., 1878, 
Pp. 233, pl. x, £°8;.9; Jo Morris, CatoBrit.. Foss., 1854, 
p. 351 (Vothetes). T. 
Loc. M. Purbeck; Durdlestone Bay. [Jaw and teeth ; Brit. Mus.] 
OCADIA, J.E. Gray, Suppl. Cat. Shield Rept., pt. i, 1870, p. 35. 
crassa (Owen), R. Lydekker, Cat. Foss. Rept. B. M., pt. iii, 1889, 
p. 110, woodcut 24. 
Emys crassus, R. Owen, Rept. London Clay, pt. i (Pal. Soc., 
1849), p. 76, pl. xxvii ; J. Morris, Cat. Brit. Foss., 1854, p. 348. 
Emys hordwellensis, H. G. Seeley, Quart. Journ. Geol. Soc., 
vol. xxxii, 1876, p. 445, woodcuts 1, 2. [Imperfect shell; 
Woodwardian Mus.] 
Loc. U. Eocene; Hordwell. [Right hyoplastron ; Brit. Mus.] 
oweni, R. Lydekker, Cat. Foss. Rept. B. M., pt. iii, 1889, p. 115, 
woodcut 25. 
?Emys testudintformis, R. Owen (errore, fide Lydekker), Rept. 
London Clay, pt. i (Pal. Soc., 1849), p. 67, pl. xxiv, f. 1-3 
(? f. 4,5). [Nuchal and neural plates ; Brit. Mus.] 
Loc. U. Eocene; Hordwell. [Portions of shell ; Brit. Mus.] 
OLIGOSTINUS, Hawkins, Great Sea Dragons, 1840. = Ichthyo- 
saurus (v. I. lonchiodon). 
OMOSAURWUS, R. Owen (70 J. Leidy, 1856), Rept. Mesoz. 
Form., pt. ii (Pal. Soc., 1875), p. 45. [? Stegosaurus, according 
to O. C. Marsh, Geol. Mag. [3] vol. vi, 1889, p. 207.] 
armatus, R. Owen, Rept. Mesoz. Form., pt. ii (Pal. Soc., 1875), 
p- 45, pls. xi-xxii, and Brit. Foss. Rept., vol. i (1884), p. 556, 
pls. Ixiv-Ixxv (Dinosauria); W. Davies, Geol. Mag. [2] 
vol. iii, 1876, p. 193, pls. vii, viii; J. W. Hulke, Quart. Journ. 
Geol. Soc., vol. xliii, 1887, p. 702; R. Lydekker, Cat. Foss. 
Rept. B. M., pt. i, 1888, p. 177. 
Stegosaurus armatus, O. C. Marsh, Geol. Mag. [3] vol. vi, 1889, 
Pp. 207. 
Loc. Kim. Clay ; Swindon. [Portions of skeleton, wanting head; 
Brit. Mus.] T. 
durobrivensis, J. W. Hulke, Quart. Journ. Geol. Soc., vol. xliii, 
1887, p. 699, woodcut 2. 
Loc. Oxford Clay (zo Kim. Clay); Peterborough. [Pelvis ; 
A. N. Leeds Coll.] 
hastiger, R. Owen, Rept. Mesoz. Form., pt. iii (Pal. Soc., 1877), 
Pp. 95, pls. xxiii, xxiv ; R. Lydekker, Cat. Foss. Rept. B. M., 
pt. i, 1888, p. 179. 
Loc. Kim. Clay; Wootton-Bassett. [Dermal spine; Brit. Mus.] 
