158 



PEARLS AND PEARLING 



anterior or heavy ends of the shells are at the right side 

 of the illustration and the posterior or thin ends of the 

 shells are at the left. 



Fig. 38 shows the exterior of the worthless "cripple." 

 It will be observed that the elevation, or "deerhorn," * is 

 on the upper shell, while in the case of the valuable 

 "cripple," shown in Fig. 39, the "deerhorn" is on the 

 lower shell. 



Amateurs should study these photographs very care- 



Fig. 40. Interior View of the Worthless "Cripple." 



