ClipArt ETC
"Diagram of a longitudinal section through the embryo of a fowl, showing formation of amnion and allantois and the relation of these membranes to the embryo. am1, inner or true amnion; am2, outer or false amnion; am.c., amniotic cavity; al., allantois; c.c., central canal of the spinal cord; co., coelom; g, gut; ys., yolk sac." -Galloway, 1915

Fowl Embryo

"Diagram of a longitudinal section through the embryo of a fowl, showing formation of amnion and allantois…