78 THE SKELETON OF THE CAT. 
iliopectineal line (7) and extends on the pubis to the symphysts. 
An eminence, the iliopectineal eminence (/’), on the iliopec- 
tineal line, lies opposite to the acetabulum at about the junction 
of the ilium and pubis. The cranial end of the bone is thick- 
ened, forming the crest (@) of the ilium. At the junction of 
the crest with the ventral border is a projection, the anterior 
superior process (#7) of human anatomy. 
The pubis (///) (including the acetabular bone) enters into 
the formation of the acetabulum (@) constituting about one- 
sixth the circumference, but less than one-sixth its area. It 
may be described as a flat, curved bone, contracted at the 
middle and expanded at the ends. The dorsal end enters 
into the acetabulum; the ventral end unites with the opposite 
bone at the symphysis pubis and sends caudad a projection, the 
ramus (2) of the pubis, which unites with the ramus of the 
opposite bone to form about two-thirds of the entire symphysis. 
At the sides of the symphysis a slightly marked angle projects 
craniad from each of the pubic bones; these two together con- 
stitute the pubic tubercle (4), for the origin of the rectus 
abdominis muscle. The surfaces of the ramus are smooth. 
One of its borders is concave and enters into the formation of 
the obturator foramen (7). Another of its borders is the ilio- 
pectineal line (7). Its third border is rough for the symphysis. 
The ischium (//) has the form of a triangular prism con- 
tracted at the middle. Its cranial end forms nearly two-thirds 
of the acetabulum. Its caudal end bears dorsad a rough 
thickening, the tuberosity of the ischium (g). From the 
caudal half of the ventral border of the bone a sickle-shaped 
process, the ramus (/) of the ischium, curves medioventrad 
and then craniad and joins the ramus of the pubis. Its medial 
border is rough and enters into the symphysis, forming the 
caudal one-third. The lateral angle of the bone is rounded. 
Its dorsal angle is marked near the cranial end by the spine (c) 
of the ischium. The concavity between this spine and the 
tuberosity corresponds to the lesser sciatic notch (/) of human 
anatomy. 
The acetabulum (d@) is cup-shaped. The ventral one-sixth 
of its border is deficient and a broad groove extends from the 
