PLATE XXIII 



Plate XXIII is from the upper surface of a section 

 through the first coccygeal vertebra posteriorly and the 

 acetabular cavities of the ilia laterally. The plane of the 

 section is 3.8 cm. anteriorly and 4.3 cm. posteriorly below 

 that of the last section. The anterior margin is 1.8 cm. 

 lower than the posterior. 



The right plica umbilicalis lateralis stretches across the 

 corner of the cavity cutting off a pocket like the one in- 

 dicated on left side of section XXII. These two spaces 

 are conical in form, about 4 cm. deep and closed everywhere 

 except at the top. , 



iiS 



