FISHERY BULLETIN: VOL. 80, NO. 2 



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W 



FIGURE 4.— a) SEM of the core of the sagitta of Fundulus heteroclitus showing the core (C) and the multiple primordia (P) sur- 

 rounds the spherules. Bar = 1 n. b) SEM showing a spherule (S) in the multiple primordia (P) of the core (C) or the sagitta. 

 B = 0.5 M . 



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