REPTILIA. 271 
PLESIOSAURUS (continued)— 
? trigonus, Cuvier, Ossem. Fossiles, ed. 2, vol. v, pt. ii, 1824, p. 486 ; 
R. Owen, Rep. Brit. Assoc., 1839 (1840), p. 78 ; J. Morris, 
Cat. Brit. Foss., 1854, p. 352. 
Loc. ?Rheetic ; Aust Cliff. [Vertebra.] 
tritarsostinus., Hawkins. wv. Plesiosaurus hawkinsi. 
trochanterius, Owen. v. Cimoliosaurus trochanterius. 
truncatus, Owen. v. Cimoliosaurus truncatus. 
validus, Phillips. v. Cimoliosaurus trochanterius. 
winspitensis, Seeley. v. Cimoliosaurus portlandicus. 
zetlandi, Blake. v. Thaumatosaurus zetlandicus. 
zetlandicus, Phillips. v. Thaumatosaurus zetlandicus. 
?sp., R. Owen, Rept. Cret. Form. (Pal. Soc., 1851), p. 66, pl. xx, 
f.7,8. [? Cimoliosaurus.] 
Loc. L. Greensand ; Shanklin. [Vertebra.] 
? sp., R. Owen, in F. Dixon, Geol. Sussex, 1850, p. 399, pl. xxxvii, 
f.15,and ed. 2, 1878, p. 426, same pl. and fig. [? Czolzosaurus.| 
Loc. U. Chalk ; Houghton, Sussex. [Tooth.] 
spp., J. F. Blake, in Tate and Blake, Yorkshire Lias, 1876, p. 252. 
[Skeleton, ironstone of Eaton ; two coracoids, ironstone of 
Skinnington ; elongated vertebra, Capricornus beds, Salt- 
burn ; dorsal vertebra, /amesonz beds, Huntcliff.] 
PLESIOSUCHUS, Owen. v. Dacosaurus. 
manseli (Hulke), Owen. v. Dacosaurus maximus. 
PLEUROCG@LUS, O. C. Marsh, Amer. Journ. Sci. [3] vol. xxxv, 
1888, p. go. 
valdensis, R. Lydekker, Geol. Mag. [3] vol. vi, 1889, p. 325. 
‘Teeth of the Hylezosaur ?,’ G. A. Mantell, Phil. Trans., 1841, 
p- 144, pl. vi, f. 9-11, and Petrifactions, 1851, p. 326, woodcut 
70,and Wonders of Geology, ed. 6, 1848, p. 438, woodcut 109; 
R. Owen, Rept. Weald. and Purb. Form., pt. iv (Pal. Soc., 
1858), p. 21, pl. viii, f. 6-g (teeth), and Paleontology, ed. 2, 
1861, p. 293. 
‘Teeth of a peculiar form,’ G. A. Mantell, Wonders of Geology, 
ed. 3, vol. i, 1839, p. 403, pl. ili, f. 4. 
Loc. Wealden; Sussex. [Teeth; Brit. Mus.] 
PLEUROSTERNUM, R. Owen, Rept. Weald. and Purb. Form., 
pt. i (Pal. Soc., 1853), p. 2 (Pleurosternon) ; R. Lydekker, 
Quart. Journ. Geol. Soc., vol. xlv, 1889, p. 513. 
MEGASTERNON, [J. E. Gray] Syn. Contents Brit. Mus., ed. 44, 
1842, p. 108 (name only, preoccupied). 
DIGERRHUM, E. D. Cope, Trans. Amer. Phil. Soc., vol. xiv 
(1870), p. 156. 
bullocki (Owen), L. Riitimeyer, Neue Denkschr. schweiz. Nat. 
Ges., vol. xxv, art. 2, 1873, p. 159; R. Lydekker and G. A. 
Boulenger, Geol. Mag. [3] vol. iv, 1887, p. 271 ; W. Davies, 
Geol. Mag. [3] vol. iv, 1887, p. 380; R. Lydekker, Quart. 
Journ. Geol. Soc., vol. xlv, 1889, p. 514, woodcuts 3, 4, and 
Cat. Foss. Rept. B. M, pt. iii, 1889, p. 206, woodcuts 45, 46. 
