CELL CLUSTKllS IN MAMMALIAN EMBRYC^S 



V. E. EMMEI, 



I'LATl-; 2 



''■--- ^'-^io 



^ 







c*, <»}a> 



^cSt*- 



10 u 



<^ 





iCL!-3> 





// 



/^. 



'"^^^ ^ 





"=^^k. 



-Ci- ' .■>-^-^ 



1^ >s^ 



421 



C:— -_„ 



THE AMERICAN JOURNAL OF ANATOMY, VOL. 19, NO. 3 



