See: opaque
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Can easily be recognized by the characteristic pattern of lighter, nontranslucent specks oriented in spiral lines on a darker, semi-translucent, corneous background, as well as alternating zones of lighter and darker close-set axial riblets on the upper side of the shell with only microscopic spiral striation on the base.
There was a 2 X 2 cm nontranslucent, hard, and tender mass just above the left testis.