EODENTIA. 
295 
Diameter of the distal end of the tibia 
transverse 
anteroposterior 
external 
internal 
Long diameter of the proximal end of the fibula. 
Transverse diameter of the middle of the shaft of the tarso-metatarsus. 
Antero posterior diameter of the external side of the tarso metatarsus. 
Transverse diameter of the distal extremity of the distal end of the tarso- 
metatarsus . 
Antero posterior diameter of the median condyle of the tarso-metatarsus- 
Length of the inner metatarsus.:.-. 
Distal width of the same. 
Length of the proximal phalange of the third digit... 
Proximal diameter of the same. 
Distal width of the same. 
Length of the penultimate phalange of the third digit, below.. 
Length of the basal phalange of the fourth digit. 
Distal width of the same. 
Length of the second phalange of the fourth digit... 
Distal width of the same. 
Length of the penultimate phalange of the fourth digit, below. 
Distal width of the same. 
0. 010 
0. 012 
0. 013 
0.011 
0. 010 
0. 009 
0.019 
0.010 
0. 017 
0. 011 
0. 029 
0. 009 
0. 0006 
0. 022 
0. 015 
0. 005 
0. 007 
0. 005 
0. 020 
0. 0038 
The remains above described were found by the writer lying together 
on the surface of the friable sandstone from which they had weathered, and 
without admixture of fragments of any other animal. 
MAMMALIA. 
EODENTIA. 
PANOLAX, Cope. 
Proc. Acad. Phila., 1874, p. 151; Ann. Kept. Chief of Engineers, 1874, ii, p. 605. 
Family Leporidce. Superior molars prismatic, transverse, with a deep 
inflection of enamel on the inner side, except in the first and last. The first 
divided by an inflection on the anterior face; the last composed of two 
columns, an internal and an external, which are distinct to the base. 
This genus reposes on a number of superior molar teeth, which I found 
lying together, but separated. I have arranged them in the order indicated 
by the corresponding series in PalcBolagus. The first molar resembles that 
of that genus, and of Lepus, where it consists of a transverse shaft, with a 
more or less well-defined anterior groove, forming a loop on the grinding- 
