734 



Fishery Bulletin 91(4), 1993 



DORSAL ACCESSORY 

 PRIMORDIUM 



CLEAR CENTRAL 

 AREA 



INNER BOUNDARY OF 



ENCLOSED PERIPHERAL 



AREA 



ANTERIOR 

 ■SCALLOPING" 



ANTERIOR ACCESSORY A 

 PRIMORDIUM 



OPAQUE CENTRAL 

 AREA 



UNENCLOSED 

 PERIPHERAL AREA 



VENTRAL ACCESSORY 

 PRIMORDIUM 



/ 



POST-ROSTRUM 



ANTIROSTRUM 



_- ROSTRUM 



Figure 1 



Schematic illustrations of Dover sole, Microstomus pacificus, otolith structure and orientation, showing terminology used in text. 

 lAl Stage-4 left sagitta, sagittal section, lateral face towards the viewer, anterior to left. The anterior cavity is confluent with the 

 anterior accessory primordium. (Bl Orientation of left and right Stage-4 sagittae, anterior to right. 



