CARDIAC-LOOP FORMATION IN CHICK PLATE 1 
BRADLEY M, PATTEN 
1-- ~~ Mes. v. 
--- V. ao. r. 
29 HOURS 30 HOURS 32 HOURS 38 HOURS E 40 HOURS 
9 somites 10 somites 12 somites 18 somites 
~ Sin-at. 
42 HOURS 44 HOURS 47 HOURS 
20 somites 22 somites 25 somites 
i 53 HOURS 
29 somites 
J 65 HOURS K 76 HOURS 100 HOURS 
33 somites 38 somites 45 somites 
393 
THE AMERICAN JOURNAL OF ANATOMY, VOL. 30, NO. 3 
