78 THE SKELETON OF THE CAT. 



iliopectineal line (/) and extends on the pubis to the symphysis. 

 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 (a) of the ilium. At the junction of 

 the crest with the ventral border is a projection, the anterior 

 superior process (/) of human anatomy. 



The pubis (///) (including the acetabular bone) enters into 

 the formation of the acetabulum (d} 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 (z) 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 (/), 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 (/). Another of its borders is the ilio- 

 pectineal line (/). 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 (/z) 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 



