Plate XV. 



Ostrea gigas Tlmnb. p. 162. 

 Fig. 1. Bounded form. Lower valve, outside. 7/10 nat. size. Yokosuka. 

 Fig. 2. Do Upper valve, inside. 3/5 nat. size. Yokosuka. 



Fig. 3. Elongated form. Lower valve, inside. 2/3 nat. size. Yokosuka. 

 Fig. 4. Do Upper valve, outside. 3/5 nat. size. Yokosuka. 



