136 FIELD COLUMBIAN MusEUM—GEOLOGY, VOL. II. 
of the left femur. The largest of these (Pl. XLIII, Fig. 11), that evidently 
immediately succeeding the sacrum, is flat at each end, and has neither 
distinct processes nor zygapophyses, and only a small, low spine on 
the posterior part; its width posteriorly is much less than that anteriorly. 
The other three vertebre are in a series, slightly separated from each 
other, and are mere nodules of bone, without processes of any kind, 
about four millimeters in length by three in width; the last one ends in 
a conical point. From the tapering of the first, and the association of 
the last three close by the side of the femur it seems very probable that 
the tail was short and slender. 
MEASUREMENTS OF VERTEBR£, 
Length, Width, Expanse, 
mm. mm. mm. 
Atlanto-axis .cSssiakt ee ee ee ee ee ee ee 14 gene wien 
Third cervical 277). pe eee nee a Une eee ee ae rie? 
méeventh cervical. Scguem ee eg eae ats, Ee 
Eignth cervical (about) 222. 2. seo ey a ne ee 9 ee Bie 
First dorsal o2o2 + sc nee eee a eee er! II re Lie 
eecond dorsalal.viuUici 2 es ee ee 10 II Oy fe 
Third dorsal: Sy hee oe a ee 10 II epsiaa 
Length.of first: five: dorsals labout). <2. ae eee 5 3c. anh Pod. 
Sixth dorsales: 2501 yee. ye ee 9 8 31 
Seventh dorsal oo owas a cee ae nee See 9 8 30 
Highth; dorsal d2 0 eck eee eee 9 75 29 
Ninti, dorsal 225) Aad Ola te es eee 9 8 pens 
Lumbar{tenth). 20. . so toe 22s eee aS 9 32 
Rirsttine«satralig 7. os ee ee ee soa ep penta Vide 9 7: 53. ee rr 
Second’ Sacral eee fie 22 ee) Sa eee ee ee es 7.5 Sey 
RTC SACTA eae tates tala team een aera ae ee date 7.5 32 
Pourthtsacta ee Ser ce eee eee ee ce ee ees een 7 28 
With sacral el ole sees ah te een Ree he ete etn eas 6 6.5 21 
Sixth isatfal sits ah ee ee ee ee et a 6 6.5 I5 
Pirrst*catidal, on caudo-cacta lg) eae eee eee oy 10(8) aes 
Distal -Caudals iccma ce ce eee eee ce 4455/43 Rage 7 aha 
RIBS. 
Thoracic. Pl. XLI, Fig. 1, 77. There are apparently four pairs of 
stout ribs arising from the first four dorsal vertebra, the first three of 
which, at least, are anchylosed to the centrum in the adult animal. They 
were doubtless all attached to the four tubercles on each side of the 
sternum. : 
Beginning with the fifth dorsal, the ribs are single-headed, and are 
very slender and delicate. Four pairs are discernible in the specimen, 
and a fifth seems to be indicated by a fragment. The largest of these, 
that apparently belonging with the fifth dorsal, is gently curved. It meas- 
