1893.] 



B. 



Pyramidalis on both 

 sides. Psoas par- 

 vus on one side. 



Pyramidalis on both, 

 sides. No psoas 

 parvus. 



D. 



Pyramidalis on one 

 side. Psoas par- 

 vus on both sides. 



E. 



Pyramidalis on one 

 side. Psoas parvus 

 on one side. 



Pyramidalis on one 

 side. No psoas 

 parvus. 



121 



Male.. ., 

 Female , 



ID wight. 



NUMBER. PER CENT. 



,18 



Both sexes 27 



Male 59 



Female 83 



Both sexes 93 



Male 4 



Female 



Both sexes 4 



Male 



Female , 



Both sexes 2 



Male 10 



Female 4 



Both sexes 14 



10.9 

 10.5 



10.8 



35.7 



33.8 



36.8 



2.4 

 



2.4 



1.1 



6 



4.7 



5.6 



Both sexes 31 



12.4 



These tables show, as would naturally be expected, that the largest 

 group (C) is that of two pyramidales and no psoas, and that this is the 

 largest in either sex. For the next largest groups we have to examine the 

 sexes separately, for we find that 29 per cent, of the men (A) have all four 

 muscles, while precisely an equal number of women (18.8 per cent.) (A. 



PROC. AMEU. PHILOS. SOC. XXXI. 140. P. PRINTED APRIL 19, 1893. 



