PELVIC GIRDLE. 33 



probably represents the scaphoid (os radiale) and os cen- 

 trale combined. 



69. The four remaining bones of the carpus (.carpalid) 

 lie in a row at the bases of the digits ; those correspond- 

 ing to the first, second, and third metacarpal bones 

 Qrapezium, trapezoid, and os magnum respectively) are 

 separate ; the carpalia of the fourth and fifth digits, on 

 the other hand, are united to form a single bone (unci- 

 form) which, however, presents a deep groove ; this 

 indicates its primitive doubleness, and will lead to the 

 belief that it is made up of two distinct pieces, unless 

 careful examination be made. 



70. Each of the five digits consists of a metacarpal 

 bone and three phalanges, except the first {follex) and 

 the fifth (minimum), which each have but two phalanges. 

 The terminal phalanx on each is long, curved, pointed, 

 and claw-like. 



"71. The Pelvic Girdle is composed of the iliac, the 

 ischial, and the pubic bone on each side. 



a. The ilium is attached to the sacral ribs, as de- 

 scribed above (i6); from there the bone runs 

 ventro-mesially and joins the ischium and os 

 pubis at the acetabulum. 



b. The pubic bones are flat plates, which meet ven- 

 trally in a mesial pubic symphysis, from which 

 a cartilaginous plate proceeds forward in the 

 abdominal wall. External to this each bone 

 has a large, pointed process, directed forward. 



c. The ischial bones meet also in a median ven- 

 tral symphysis, and are much like the pubics 



