Cope.] 80 [April 7, 
lar forms of the same, separates the animal from the W. jeffersondi. The 
only known molar of M. valédus, Leidy, is like nothing found in the 
present species, and M. rodens and M. meridionalis each have their 
peculiar features. I therefore call the present animal J/. wheatleyt. 
4 
Another molar, perhaps the third inferior of the three, is larger, and 
appears to belong to another individual; it is a little wider inwardly, 
and resembles Leidy’s fig. 13 of Pl. XVI., except in its narrower angle 
and perfect symmetry. It may belong to Jf. wheatleyi, but the outer 
angle is regularly rounded; it may be M. sphenodon. Vt differs from 
those of M. jeffersonit as the MM. wheatley?, in the greater extension in a 
transyerse direction, and in the concavity of one of the long sides. The 
enclosed area of osteodentine is in section a frustrum of a narrow 
triangle, instead of rounded parallelogrammice as in M. jeffersonit. 
Measurements of teeth. 
M. 
Long diameter, (Fig. 5) light cold. canine molar................. 0.0316 
Short re e CEU e ean, te Oe 018 
Long sha Or GBs 3s)" SO A OST ae eae Tick 0825 
Short i iy - SO ED ae Ne 019 
Long ne of (Fig. 6) black Oy TAT TR Ossi aces 085 
Short se ae Js SONS MINT ener noe} 017 
