PLATE 4 
EXPLANATION OF FIGURES 
18 Rectus abdominis muscles of rabbit (Lepus). After Huxley. 
19 Rectus abdominis muscles of pocket gopher (Geomys bursarius), open 
type of pelvis. ’ 
20 Rectus abdominis muscles of pocket gopher (Geomys bursarius), closed 
type of pelvis. 
21 Rectus abdominis muscles of Western pocket gopher (Thomomys bottae 
bottae), closed type of. pelvis. 
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