UNGULATA. 
Mamm. 45 
B . Perissodactyla. 
Equidce, homology of internal pillars of upper molars, Ameghino, An. 
Mus. Buenos Aires ix, pp. 1 et seq. ; ancestry, Lydekker, Knowledge 
xxvii, p. 16, Osborn, Century Mag. lxix, p. 1 ; hoof-structure, 
Lydekker, Field civ, p. 819. 
Equus caballus, ancestry, Osborn, op. cit., Ewart, Tr. Highland Soc. 
1904, p. 1, Nature lxix, p. 590, Lydekker, Knowledge and Scientific 
News i, pp. 16 & 171 ; rudimentary horns in, Cunningham, Field ciii, 
p. 777 ; c. celticus (Ewart), relationship to Tarpan, Stejneger, Naturen 
1904, p. 161, Lydekker, Field civ, p. 276 ; rudimentary larmial cavity 
in, Lydekker, P. Zool. Soc. London 1904, i, p. 427, and J. Bombay 
Soc. xv, p. 703 ; functional larmier in an Arab, Lydekker, Field, 
op. cit. p. 276 ; inconstancy of trapezium, Bradley, P. Phys. Soc. 
Edinb. xvi, p. 8 ; prehistoric race and its employment in equitation, 
Landois, Jahresb. Westfal. Ver. xxx, pp. 11 & 14, xxxi, p. 158 ; 
skulls from Italy, Maggi, Bend. 1st. Lombardo (2) xxxvii, p. 792 ; 
heredity of intelligence, Davenport, Science xix, p. 151 ; muscular 
abnormality, Chaine, Pr.-verb. Soc. Bordeaux 1898-9, p. Ill ; testicle, 
Bouin & Angel, Arch. Zool. exp. (4) ii, p. cxli ; przewalskii , affinities, 
Ewart, P. R. Soc. Edinb. xxiv, p. 460 (1903) ; quagga , extinction and 
specimens remaining, Renshaw, Natural History Essays, p. 169, 
skull and markings, Lydekker, P. Zool. Soc. London, op. cit. p. 426, 
do. and local races, with q. danielli , Cape Colony, n. subsp., p. 319, 
Pocock, Ann. Nat. Hist. (7) xiv, p. 313 ; hemionus and h. Hang , 
figured, Lydekker, op. cit. p. 431, pis. xxvii & xxviii ; onager and 
its races, with o. castaneus , Kobdo, p. 590, n. subsp., and the two 
wild forms of asinus , figured, Lydekker, Nov. Zool. xi, p. 583, pis. 
xvii-xx ; hemionus ,( = onager) from Kesslerloch, Nuesch & Studer, 
Denk. Schweiz. Ges. xxxix, pt. 2, p. 95, pi. ii ; caballus asiaticus , the 
name for the Arab, with note on its ancestry, Lydekker, Field civ, 
p. 1073; t stenonis, mandible from Mosbach, Reichenau, Notizbl. Ver. 
geol. Landesanst. Darmstadt (4) xxiv, p. 48. 
\Hipparion and allied forms, proper generic names and characteristics, 
Gidley, Bull. Amer. Mus. xx, p. 191. 
t Mesohippus hypostylus, p. 170, proteulophus , p. 171, obliquidens, eulophus , 
p. 173, meteulophus , p. 174, brachy stylus, p. 175, validus, p. 177, 
gidlcyi, crassicuspis , p. 178, Oligocene, N. America, Osborn, Bull. 
Amer. Mus. xx, n. spp. 
t Paratapirus, n. g. for J\ lielveticus Meyer, DepjSret & Douxamt, Abh. 
Schweiz, pal. Ges. xxix, art. 1, p. 34, 1902. 
Rhinocerotidce, American fossil forms, Osborn, Bull. Amer. Mus. xx, 
p. 307. 
Rhinoceros \goldfussi and list of other fossil species of the family, Roger, 
Ber. Ver. Augsburg xxxiv, p. 1, 1901, and xxxv, p. 1, 1902, species 
from the Pliocene of Samos, Weber, Bull. Soc. Moscou 1903, p. 477 ; 
Diceratherium ) + asphaltense , Oligocene, Savoy, DepIsret & Douxami, 
Abh. Schweiz, pal. Ges. xxix, art. 1, p. 11, 1902, n. sp. 
t Ccenopus persistans , p. 318, Teleoceras medicornutus , p. 319, Aphelops 
planiceps, p. 321, brachyodus, p. 322, Tertiary, N. America, Osborn, 
Bull. Amer. Mus. xx, n. spp. 
t Lophiodon and Chasmotherium, dentition and taxonomy, Stehlin, Abh. 
Schweiz, pal. Ges. xxx, art. 1. 
