266 BRITISH FOSSIL VERTEBRATA. 
PLESIOSAURUWS, W. D. Conybeare, Trans. Geol. Soc., vol. v 
? 
(1821), p. 560; T. H. Huxley, Quart. Journ. Geol. Soc., vol. 
xiv, 1858, p. 281 ; L. Barrett, Rep. Brit. Assoc., 1858 (1859), 
Sect., p. 78, and Ann. Mag. Nat. Hist. [3] vol. ii, 1858, 
p- 361, pl. xiii (atlas and axis); R. Owen, Rep. Brit. Assoc., 
1839 (1840), p. 49, and Ann. Mag. Nat. Hist., vol. xx, 1847, 
p. 217 (atlas and axis), and Palzontology, ed. 2, 1861, p. 243, 
and Quart. Journ. Geol. Soc., vol. xxxix, 1883, p. 134; H. G. 
Seeley, Rep. Brit. Assoc., 1887 (1888), p. 697, and Geol. 
Mag. [3] vol. iv, 1887, p. 562 (development of young.) 
cequalis, Phillips. wv. Peloneustes zqualis. 
ajjinis, Owen. v. Cimoliosaurus trochanterius. 
arcuatus, Owen. v. Thaumatosaurus arcuatus. 
bernardi, Owen. v. Cimoliosaurus bernardi. 
? bitractensis, H. E. Sauvage, Ann. Sci. Géol., vol. xiv, art. 3, 
1883, p. 20, pl. viii, f 5, pl. ix, f. 1, 23; R. Lydekker @ae 
Foss. Rept. B. M., pt. il, 1889, p. 283. 
Loc. Rhetic ; Aust Cliff. [Vertebre,; Brit. Mus.] 
brachistospondylus, Hulke. wv. Cimoliosaurus brachistospon- 
dylus. 
brachycephalus, Owen. v. Plesiosaurus macrocephalus. 
brachyspondylus, Owen. v. Pliosaurus brachyspondylus. 
brachyspondylaus, Phillips. v. Cimoliosaurus trochanterius. 
carinatus, Cuvier. v. Thaumatosaurus carinatus. 
carinatus, Phillips. v. Cimoliosaurus portlandicus. 
cliduchus, Seeley. v. Plesiosaurus dolichodeirus. 
colospondylus, R. Owen, Rept. Liassic Form., pt. 1 (Pal. Soc., 
1865), p. 12 (incompletely defined) ; J. F. blake, in Tate and 
Blake, Yorkshire Lias, 1876, p. 252. [? P. dongirostris.] 
Loc. U. Lias ; Whitby. [Vertebre ; Whitby Mus.] 
compressus, R. Owen, Cat. Foss. Rept. Mus. Roy. Coll. 
Surgeons, 1854, p. 61. 
Loc. Lias; Somerset. [Dorsalvertebra; Mus. R. Coll. Surgeons. ] 
constrictus, Owen. v. Cimoliosaurus constrictus. 
conybearei, [-ri] W. J. Sollas, Quart. Journ. Geol. Soc., vol. 
xxxvii, 1881, p. 440, pls. xxili, xxiv ; [-ri] R. Lydekker, Cat. 
Foss. Rept. B. M., pt. ii, 1889, p. 269. 
Plesiosaurus laticeps (R. Owen, MS.), W. Davies, Geol. Mag., 
vol. iv, 1867, p. 144 (undefined). [Skeleton ; Brit. Mus.] 
Plestosaurus rostratus, R. Owen (pars), Rept. Liassic Form., 
pt. i (Pal. Soc., 1865), p. 28, pl. xii. (Skull; Brit. Mus.] 
Loc. L. Lias ; Lyme Regis. [Imperfect skeleton ; Bristol Mus.] 
costatus, RK. Owen, Rep. Brit. Assoc., 1839 (1840), p. 80; 
J. Morris, "Cat. Brit. Foss:, 1854, p: 3525: diydekker, 
Cat. Foss. Rept. B. M., pt. 11, 1889, p. 282. 
? Plesiosaurus dibothrius, R. Owen, Cat. Foss. Rept. Mus. Roy. 
Coll. Surgeons, 1854, p.63. [Vertebra ; Mus. R. Coll. Surgeons. } 
Loc. Rhetic ; Aust Cliff. [Cervical vertebra; Bristol Mus. ] 
