44 Transactions. — Zoology. 



Breadth of entire pelvis : The maximum distance between 

 the outer Hps of the iliac crests. 



Breadth betivecn anterior superior iliac spines : The dis- 

 tance between the most prominent parts of these eminences. 



Breadth between posterior superior iliac spines ; The dis- 

 tance between the inner borders of the spines. 



Height of entire pelvis : From the highest part of the ihac 

 crest to the most distant part of the tuberosity of the 

 ischium. 



Breadth betiueen the outer surfaces of the tuberosities of the 

 ischia : The maximum width. 



Breadth betiveen the ischial spines : Between their tips. 



Breadth of Sacrum : The maximum width across the base. 



Length of Sacrum : The distance in a straight Hne from 

 the middle of the anterior border of the upper surface of the 

 first sacral vertebra to the corresponding point on the lower 

 border of the fifth. Even in sacra with six vertebral elements 

 the same points are chosen. 



Length of sacral arc : The length of the sacrum taken in a 

 curve along the front of the bodies. By comparing this length 

 with that taken in a direct line, the arc with its cord, a good 

 idea is got of the degree of curvature of the bone. 



Pubo-ischiatic depth : The distance between the upper 

 surface of the pubis immediately in front of the ilio-pectineal 

 eminence and the lowest part of the tuberosity of the ischium. 

 This gives the depth of the pelvic cavity laterally. 



Depth of p2ihic symphysis. 



Transverse diameter of pelvic brim : The maximum width 

 between the ilio-pectineal lines. 



Sagittal or conjugate diameter of pelvic brim : From the 

 middle of the upper margin of the anterior surface of the first 

 sacral vertebra to the nearest point on the posterior surface 

 of the pubic symphysis. When a median ridge is present on 

 the pelvic face of the symphysis the measurement is taken 

 somewhat to one side of the middle line. 



Transverse diameter of pelvic outlet : Taken as recom- 

 mended by Dr. Garson, between the most widely separated 

 points on the lines which pass forwards from the ischial 

 spines towards the lower ends of the obturator foramina. 



Sagittal diameter of pelvic outlet : From the centre of the 

 lower margin of the fifth sacral vertebra to the lowest part of 

 the pubic symphysis. 



Subpubic angle. 



Height of acetabulum : From the upper margin below the 

 anterior inferior iliac spine to the opposite border of. the 

 cavity. 



Breadth of acetabulum : Taken across the cavity at right 

 angles to the previous measurement. 



