418 INDEX GENERUM MAMMALIUM. 
Metaepanorthus— Continued. 
Species, 3: Metaepanorthus intermedius Ameghino, M. complicatus Ameghino, and 
M. holmbergi Ameghino, from the Eocene of Patagonia. 
Extinct. 
Metaepanorthus: etc, after; + Epanorthus. 
Metalophodon Corr, 1873. Ungulata, Amblypoda, Coryphodontide. 
[Palzeont. Bull., No. 10, p. 1, Dec., 1872—nomen nudum]; Proc. Am. Philos. Soc., 
XII, for Jul y- Dec., 1872, pp. 542-544, Jan,, 1873; ibid., XIII, 71, 1873. 
Type: Metalophodon armatus Cope, from the Eocene in the vicinity of Black 
Buttes, Wyoming. 
Extinct. 
Metalophodon: u£rá, aiter; Ad@os, crest; 66@v=d5o0vs, tooth. ''The most 
prominent [characters] are: First, the failure of the lateral or straight limbs of 
the crescent of the tooth-crown to meet at the apex, in the molars proper. 
The first character appears to me to be of generic importance, hence 
the name." (Coprk.) 
Metamynodon Scorr & OssonN, 1887. Ungulata, Perissodactyla, Amynodontide. 
Bull. Mus. Comp. Zool., XIII, No. 5, pp. 165-169, figs. 7-9, Sept., 1887. 
Type: Metamynodon planifrons Scott & Osborn, from the White River beds (Oligo- 
cene) of South Dakota. 
Extinct. '' Represented by a single skull in fine preservation and the anterior 
portion of the left mandibular ramus." 
Metamynodon: eta, after; + Amynodon. 
Metanthropos Corr, 1879. Primates, Hominide. 
Proc. Acad. Nat. Sci. Phila., Nov. 4, 1879, 194 (provisional name). 
A genus proposed for man having the number of teeth reduced to 30: I3, C+, Pm?, 
M3, in case the character becomes constant at some future day. ‘‘ My friend 
Dr. C. N. Pierce, an experienced and scientific dentist of this city [Philadel- 
phia], informs me that he knows of twenty-eight families in which the external 
superior incisors are absent; to these four families may be added, which have 
fallen under my own observation." (Cope. ) 
Metanthropos: werd, next to, next after; &àv6pczo0s, man—in allusion to the 
reduced number of teeth. 
Metarctos Gaupry, 1860. Ferze, Canide. 
Comptes Rendus, Paris, LI, No. 24, p. 926, July—Dec., 1860. 
Type: Gulo diaphorus Kaup, from the Pliocene of Eppelsheim, Germany. 
Gaudry’s description of the genus is based on bones from the Pikermi beds 
of Greece, which are considered identical with Kaup’s species. 
Extinct. Based on ‘des máchoires inférieures. 
Metarctos: jeeta, after; &pkros, bear—‘‘pour indiquer que sans doute, dans la 
série zoologique, il devra se placer entre les Ours et les Carnivores digitigrades.”” 
Metasimia AmEGHINO, 1884. Primates, id 
Filogenia, 374, 1884; Cont. Conocimiento Mamif. Fósil. Repüb. Argentina, in 
Act. Acad. Nac. Cien. Córdoba, VI, 94, 1889. 
Hypothetical genus, defined to show the probable evolution of the Orang Utan. 
** Los orangutanes desígnanse con el nombre genérico Simia, que conservaremos 
para el tipo más antiguo provisto de uiia en el pulgar del pie, designando el 
tipo más moderno que de él se ha derivado y que carece de ufia con el nombre 
de Metasimia (después de Simia)." (AMEGHINO. ) 
Metasimia: uer, after; + Simia. 
Metaxytherium Cnnisror, 1840. Sirenia, Halitheriide. 
L'Institut, Paris, VIII, 1* sect, No. 352, pp. 322-323, Sept. 24, 1840; Comptes 
Rendus, Paris, XI, 527, 1840; Ann. Sci. Nat., Paris, 2° sér., XV, 331-335, 
pl. vir, figs. 1-3, 5-6, 9-10, June, 1841. 
Type: Species not mentioned. Based on remains from Angers and Montpellier, 
France, consisting of a mutilated skull, with molars identical with those of 
