_Pelycodus_, Cope, Cat. Verteb. Eoc. New Mex., p. 13 (1875).
_Tomitherium_, Cope, Rep. U. S. Geol. Surv. W. of 100° mer., ii., p. 135
(in part).
_Lemuravus_, Marsh, Amer. Journ. Sci., 1875, i., p. 239.
{122}This genus is characterised by the second pre-molar having always two
roots; the anterior has one root and the third three; the posterior has one
external and one internal cusp. Of the true molars, all have two external
cusps; the anterior and median have two internal cusps and the posterior
has only one; of the lower teeth the posterior pre-molar has an internal
cusp and a heel; the next one has no internal cusp; the molars often have
the fore inner cusps double; the posterior molar has a strong heel. This
genus contains three species, all described by Cope (P. JARROVII, P. TUTUS,
P. FRUGIVORUS), with the hind inner cusp of the upper molars distinct from
the heel; and P. ANGULATUS, in which that cusp is small and is on the heel.
Their remains have been found in the Lower Eocene (Wasatch) beds of New
Mexico. P. HELVETICUS has been described from the Upper Eocene of
Egerkingen.