THE BILATERALITY OF THE PIGEON'S EGG 



GEORGE W. BARTELMEZ 



PLATE 7 



3^ 



31 



"m.a. 



ma-.--- 



23 



5t 



37 



-iSi&W" 



St 



T^r ^ 'f 



3(, 



JOURNAL OF MORPHOLOGY, VOL. 23, NO. 2 



327 



