1915.| Matthew and Granger, Lower Eocene Wasatch and Wind River Faunas. 49 
Oxyena lupina Cope 1874. 
Oxyena lupina Corr 1874, Rep. Vert. Foss. New Mex., p. 11; 1875, Syst. Cat. 
Koc. Vert. New Mex., p. 123; 1877, Ext. Vert. New Mex., p. 101, pl. xxxiv, figs. 14—- 
al; Dit meev, fies. oe 
Syn., Oxyena huerfanensis OSBORN 1897, Bull. A. M.N. ise Vol TX, pe 255: 
Oxyena morsitans Cope 1874, l. c. 
Type, U.S. Nat. Mus. No. 1049, upper and lower teeth and a few skeleton frag- 
ments, from Wasatch of New Mexico. Figured in 1877, l. c., pl. xxxiv, figs. 14-30. 
Distinctive characters: (1) trigonids of lower molars longer than wide, metaconid 
and heel of my much reduced; (2) m; smaller than m, (in all specimens with the doubt- 
ful exception of the type); (8) premolars moderately compressed, anterior basal 
cusp of ps well developed; canines moderately long; (4) metastyle of upper carnassial 
much elongate and m? reduced in size; (5) deuterocone of p* with posterior flange; 
(6) p? with distinct internal root. 
The large amount of additional material for comparison, including 
topotypes from the New Mexican Wasatch shows that this species is dis- 
tinct and decidedly more progressive than the Big Horn specimens which 
have been referred to it by Osborn and Wortman. The metaconid and heel 
of mz are much smaller, the shear more anteroposterior, the metastyle of m! 
more extended, and m? evidently more reduced. O. huerfanensis agrees 
with the type of O. lupina, although not with the incorrectly referred Big 
Horn specimens with which Osborn’s comparisons were made. 
Nos. 16219, 16755 and 16216, lower jaws from the New Mexican Wasatch, 
agree with O. lupina, except for slightly smaller size. ‘The two former are 
from the upper faunal zone, the third from the top of the lower zone. A 
fourth specimen, No. 16218, consisting of milk and unworn permanent 
teeth and other fragments is more doubtfully referable; it is from the lower 
beds. 
Oxyena forcipata Cope 1874. 
Oxyena forcipata Copz, 1874, Rep. Vert. Foss. New Mex., p. 12; 1875, Syst. Cat. 
Vert. Soc. New Mex.,.p. 105, pl. xxxvi, xxxv, figs. 7-12, xxxvil, figs. 1-5; 1885, Tert. 
Vert., p. 318, pl. xxxivb, xxive. Ossorn, 1892, Bull. A. M. N. H., Vol. IV, p. 109. 
Oxyena lupina OsBorn, 1892, Bull. A. M. N. H., Vol. IV, p. 108, fig. 9; Wort- _ 
MAN; 1899, ibid., Vol. XII, p. 140, pl. vii and text figs. 1 and 2; Osporn, 1900, ibid., 
Vol. XU, ps 276, pl xvi. 
Not O. lupina of Cope. 
Type, U. 8. Nat. Mus. No. 1029, lower jaws from the Wasatch of New Mexico. 
Distinctive characters: (1) trigonids of lower molars about as long as wide, meta- 
conid and heel of mz moderately large; (2) mi smaller than m2; (3) premolars more 
robust than in lupina, less than in equidens, ps with distinct anterior basal cusp; (4) 
upper molars relatively larger than in lupina, carnassial metastyle less elongate; 
