PLATE XLVI 



Fig. I. — Large yolk (weight, 30.12 gm.) with two germ disks; found in a large hen's 



egg- 

 Fig. 2. — Fused immature yolks (weight, 1.45 gm.); found in a small hen's egg. 

 Fig. 3. — Type I double-yolked egg, showing two yolks with separate vitelline mem- 

 branes but inclosed in a common chalaziferous layer. The yolks were slightly pressed 

 apart before photographing, in order to show that the vitelline membranes were 

 entirel)' separate. 



(386) 



