. 164 MEMOIRS OF THE CARNEGIE MUSEUM 
ence in the metatarsals II., III., and IV., as is also the case in Aplodontia and 
Cynomys. The proximal articulation in mt. IIL. is slightly oblique, and extends 
to the posterior end of the plantar tuberosity. The shaft is broad, slightly con- 
stricted, depressed, and the distal articulation is moderately reflected on the anterior 
face of the bone. There is a strong keel. 
Metatarsal IV, is slightly lighter than mt. III., in the type. In the beaver, this 
digit is a little the heaviest of the series. In the fossil the proximal end has some- 
what similar interlocking characters with mt. III. and the cuboid, as in Cynomys 
and Aplodontia. These latter genera, especially Cynomys, have more rounded and 
much longer metatarsals than S. fossor. In Aplodontia, the metatarsals II., I]. 
and IV. are approximately of the same length as those of S. fossor, but they are 
much lighter. 
Metatarsal V. (PJ. XVIIL., fig. 14) is oniy half as long as mt. 1V. in the type. Its 
relative length is much less than in Cynomys or Aplodontia. In the beaver the fifth 
digit is relatively longer than in Cynomys. Metatarsal V. articulates with the outer 
side of mt. [V., and has no direct articulation for the cuboid. In Cynomys the 
superior end of mt. V. continues above the fourth metatarsal articulation in an up- 
ward and outward direction, terminating in a strong tuberosity. This tuberosity is 
developed in a much less degree in Steneofiber fossor, and is more like that of the 
beaver. The shaft of the bone in the fossil is short, constricted, and trihedral. The 
distal end is an enlarged, rounded knob, with distinct articulation for the first 
phalanx. 
Phalanges. —The first and second row of phalanges are broad and depressed, 
similar to those in the manus. The articulation for the unguals is broad, plane, and 
well rounded on the anterior face of the bone. The unguals are somewhat smaller 
than on the fore foot, but of practically the same shape. The plantar rugosity is 
not so prominent as that of the manus. 
MEASUREMENTS. 
Greatestilength of pelvis: ses: cece cer seston weiosncceicoa nals uatinn os re hoabne sfaelgseenene sae ae o ease eo Renecetene 66 mm. 
Greatest width of superior border of ilium................2..cc ccc ee cece cence eerste cece este eeeeeeeceeeeeues 11 se 
Length of ilium from acetabulum to supra-iliac border. ...............cccesecee cece ec eee eee eeceeee eee eienees : 
Length of ischium from posterior border of acetabulum to ischial tuberosity.... 
Greatest width of ischium and pubis, posteriorly................0-.0cc.ceeeeeeeceeee eee ce ec erssee ness eeeeees 26 ‘ 
Vertical diameter of ischium and pubis at symphysis, when pelvis is in position. .................. 15 
CNsE Hess NET PAIN Ohi TET oo: covsosoq90d09Ne 0006000 sono c9EenOseooDoHo0 SSaoDbaINCEDsD960000000 960050505 can000a7000000000 
Transverse diameter of proximal end of femur... 
Transverse diameter of distal end of femur.................ccccceceeceeeeecne eee ecenee eects eens eeeceeeteneneeteee us 
Greatestilengthvotmtibiaerccssceenecescicm se oclsameciseaeeessseemdscercatrescreccinsteceerercicecceete cece encenes 51 es 
Greatest antero-posterior diameter of tibia at proximal end...................-..066+ odso0scon00G000D0c00000 12 ef 
