306 
A MEMOIR UPON THE GENUS 
The proximal portion of the pubic border is very prominent, producing in this 
portion of the pelvis a strongly triangular section. At the distal part of the neck 
this border disappears. The neck is long and very broad compared with the other 
pelvic dimensions. It is longer and rises more gradually from the acetabulum than 
in the Rhinoceros ; its section is triangular, being flat externally and subdivided 
internally by the pubic border. 
Above and below the neck is thin, with the basal portion of the same very 
heavy, owing to the presence of the large rectus tuberosity. The acetabulum is 
much longer than high ; its anterior and superior rim is very prominent, being 
limited anteriorly by a well defined anterior border. The depression for the ligamen- 
tum teres is very long and narrow and penetrates half way across the surface 
of the acetabulum. The acetabulum of this species difiers in form from that 
of the Rhinoceros. In the latter it is very high and narrow with only a slight 
depression for the ligament. 
Figure 3. — Pelvis of Palseosyops paludosus ; one- 
sixth natural size. Si, ih, oh, borders of the ilium ; 
a, acetabulum ; il, ilium. 
Ischium . — The ischial division of the pelvis is short ; its border above the aceta- 
bulum exhibits a slight spine roughened at its basal portion. There is no decided 
ischial notch as in the Rhinoceros. In the latter this tuberosity is very prominent 
and triangular in outline. The middle part of the ischium is triangular in section. 
The neck tapers gradually to the ischial tuberosity, which is very difi'erent in form 
from that of the Rhinoceros. This portion of the ischium in P. paludosus forms a 
broad plate, rounded at the extremity, with the tuberosity not constricted off as in 
the Rhinoceros. The ischial plate becomes thin as it approaches the symphysis, 
and is limited behind by a strongly convex border. The lower portion of the ischium 
and also all of the pubis are wanting in this specimen. The broken extremitv of 
the ischium is very small, and probably the ischim formed but a small 
part of the symphysis. The obturator foramen in this species is oval 
in outline, being larger and not as broad as the same foramen in the 
