The three annuli demonstrate the abrupt narrowing, then widening of the circuli, a com-mon feature of the annulus. Scale impression from a male dolphin (age-group III), 1425 mm FL, captured 17 Feb. annuli (dark banding pattern) are more visible and the circuli are more. required interpretation of the pattern of the circuli. On the scales of Brevoortia tyrannus and Pomolobus mediocris and others of the Clupeid the annuli cross the circuli at more or less acute angles. or circuli are visible from the surface, such as the weathervane scallops. ![]() ![]()
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