UNGULATA. 
Mamm. 45 
B. Pekissodactyla. 
Equidce, homology of internal pillars of upper molars, Ameghino, An, 
Mas. Buenos Aires ix, pp. 1 et seq. ; ancestry, Lydekker, Knowledge 
xxvii, p. 16, OsBORN, Century Mag. Ixix, p. 1 ; hoof-structure, 
Lydekker, Field civ, p. 819. 
Eqmis cahallus^ ancestry, Osborn, op. cit., Ewart, Tr. Highland Soc. 
1904, p. 1, Nature Ixix, 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, Rend. 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 & Ancel, 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. castaiieus, Kobdo, p. 590, n. subsp., and the two 
wild forms of asimis, 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 ; cahallus asiaticus, the 
name for the Arab, with note on its ancestry, Lydekker, Field civ, 
p. 1073; -fstenonis, 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. 
\Mesohippus hypostylus, p. 110, proteuloplms, p. 171, ohliquidens, eulophus, 
p. 173, meteulophus, p. 174, hrachy stylus, p. 175, validus, p. 177, 
gidleyi, crassicuspis, p. 178, Oligocene, N. America, Osborn, Bull. 
Amer. Mus. xx, n. spp. 
fParatapirus, n. g. for F. helveticus Meyer, Deperet & Douxami, Abh. 
Schweiz. pal. Ges. xxix, art. 1, p. 34, 1902. 
Rhinocerotidce, American fossil forms, Osborn, Bull. Amer. Mus. xx, 
p. 307. 
Rhinoceros fgoldfussi 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) iasphaltense, Oligocene, Savoy, Deperet & Douxami, 
Abh. Schweiz. pal. Ges. xxix, art. 1, p. 11, 1902, n. sp. 
\Cmiopus persistans, p. 318, Teleoceras medicornutus, p. 319, Aphelops 
pla/iiiceps, p. 321, hrachyodus, p. 322, Tertiary, N. America, Osborn, 
Bull. Amer. Mus. xx, n. spp. 
iLophiodon and Chasmotheriuni, dentition and taxonomy, Stehlin, Abh. 
Schweiz. pal. Ges. xxx, art. 1. 
