FISHERY BULLETIN: VOL. 82, NO. 1 





200jum 



B 



/ 



/*>..J 





/K'&~ 



^ 



>• 



ft 



50/im 



Figure 8.— Untreated tooth of live dolphin ACM 103 extracted 25 January 1980. A. About 

 14'/2GLGs indicated (heavy dark marks) (39X). B. GLGs 8-14% showing thin, light boundary layers 

 with dark margins. Thirteen LMLs indicated in each GLG 8-12 are particularly well developed 

 (150X). 



Comparisons of age-specific GLG thickness among 

 the specimens suggest that the animals deposited a 

 GLG of similar thickness in the same year of life. In 

 the first and second year, 240 /xm thick GLGs were 

 deposited. In the third, fourth, fifth, sixth, and 

 seventh years, thickness of GLGs averaged 171, 145, 



218 



119, 95, and 87 ju.m respectively. From the 8th to the 

 1 1th year, GLGs were between 71 and 55 jum thick. 

 The data in Table 1 represent averages of at least 

 three measurements per GLG per specimen. 



Cemental labels.— Relatively few TCL labels were 



