296 
EODENTIA. 
face of the crown. The last molar is the smallest, as in those genera, hut, 
being composed of two distinct columns, is quite different from that of the 
two genera named, where it consists of a single simple shaft. 
The only species of this genus yet known differs in various respects, 
perhaps specific only, from those of Palceolagus. One of these is the presence 
of a band of cementum on the inner side of the tooth, which fills the groove. 
On the first molar, this band is on the anterior face, a fact which caused me 
to view it as the inner side in my original description, so that the crown 
was regarded as longitudinal, instead of transverse, which is its true position. 
The number of molar teeth is unknown, but, by analogy with the allied 
genera, should be 
Panolax sanctaefidaei, Cope. 
Plate Ixix, figs. 16-22. 
Loc. cit., p. 151; Ann. Eept. Chief of Engineers, 1874, ii, p. 605, 
The crowns of the superior molars are strongly curved outward; in the 
intermediate molars, the outer edge is subacute, on account of a bevel of the 
outer part of the anterior face, which is slightly concave. In these teeth, 
enamel is present only on the anterior and interior aspects of the shaft, being 
concealed in the latter position by a narrow, but rather thick, band of 
cementum. The posterior face is naked. The first molar is smaller than 
the others, and is slightly curved backward as well as outward. Its outer 
border is obtuse, but narrower than the inner. Th^. enamel covers only the 
internal and half of the anterior faces; in the former position, its margin at 
the groo.ve is concealed by the cementum band. The last molar is equal in 
its transverse and antero-posterior diameters, and is strongly curved out¬ 
ward. The exterior column is the smaller, and is subround in section; the 
interior is oval and antero-posterior. Both anterior and posterior faces are 
grooved, but the posterior is the only enameled face, and is divided also by 
a band of cementum. 
A penultimate molar in a fragment of the jaw is transverse in position, 
as in the true Rabbits. 
