(SEX, STUDIES. XI PLATE 7 
ALICE M. BORING AND RAYMOND PEARL 
ee 
=* 7 
S14 
Pon 4 
ae eo 6 oS r: ~ 
gin Fs 
: CHT ea & > 
UB a 
Pas. nt 
= aes 
ee 
ioe 
43 
