MAMMALIA. 377 
PLAGIOLOPHUS, Pomel. v. Palzotherium. 
annectens, Pomel. v. Palwotherium annectens. 
minor, Pomel. v. Palzotherium minus. 
PLATYCHEROPS, E. Charlesworth, Rep. Brit. Assoc., 1854 
(1855), Sect., p. 80. 
MIOLOPHUS, R. Owen, Geol. Mag., vol. ii, 1865, p. 339. 
richardsoni, [-ii] E. Charlesworth, Rep. Brit. Assoc., 1854 (1855), 
Sect., p. 80 ; H. Woodward, Geol. Mag., vol. iii, 1866, p. 48 ; 
R. Lydekker, Cat. Foss. Mamm. B. M., pt. v, 1887, p. 4. 
Miolophus planiceps, R. Owen, Geol. Mag., vol. ii, 1865, p. 339, 
pl. xf 9, 3 T. (Miolophus.) 
Platycherops = Esthonyx, R. Lydekker, Geol. Mag. [3] vol. ii, 
1885, p. 360. 
Loc. London Clay; Herne Bay. [Palatal portion of skull; 
York Mus.] 
PLESIOCETOPSITS, Brandt. v. Cetotherium. 
brevifrons, Brandt. v. Cetotherium brevifrons. 
dubius, Brandt. v. Cetotherium dubium. 
hupschi, Brandt. v.Cetotherium hupschi. 
PLESIOCETUS, Van Beneden. v. Cetotherium: 
brialmonti, Van Beneden. v. Cetotherium brialmonti. 
dubius, Van Beneden. v. Cetotherium dubium. 
garopi, Van Beneden. v. Balenoptera garopi. 
hupschi, Van Beneden. v. Cetotherium hupschi. 
PLIOLOPHUS, Owen. v. Hyracotherium. 
vulpiceps, Owen. v. Hyracotherium leporinum. 
PLIOPRION, Cope. v. Plagiaulax. 
minor, Cope. v. Plagiaulax minor. 
PSEUDORCA, J. T. Reinhardt, Oversigt K. Danske Vid. Selsk. 
Forh., 1862, p. 151. 
crassidens (Owen), W. H. Flower, Cat. Osteol. Dent. Vert. 
Mus. Roy. Coll. Surgeons, 1884, p. 573. 
Phocena crassidens, R. Owen, Brit. Foss. Mamm., 1846, p. 516, 
woodcuts 213, 214, 216; J. Morris, Cat. Brit. Foss., 1854, p. 361. 
Loc. Prehist.; Fen near Stamford (Lincolnshire). [Skeleton ; 
Mus. Stamford Institution. ] 
PTERODON, H. D. de Blainville, Ann. Franc. et Etrang. d’Anat. 
et Physiol., vol. iii, 1839, p. 23. 
dasyuroides, H. D. de Blainville, 747d. p. 23 ;. R. Lydekker, 
Geol. Mag. [3] vol. i, 1884, p. 444, and Cat. Foss. Mamm. 
B. Mi, pt. 1;.1885; p.-33. 
Loc. Bembridge Limest. ; I. of Wight. [7eeth,; Brit. Mus.] Te 
