Fig. 6.

(a,b) Transmitted light micrographs of intradian lines between Retzius lines. (a) Four cross-striations are evident along a vertical prism (solid arrow) between a pair of Retzius lines (dotted lines), and eight intradian lines are present within the same interval (open arrows, downward-pointing prisms) (individual CF 326). (b) Eight intradian lines (open arrows) between a pair of Retzius lines (dotted lines) (individual M6898). In both images the enamel surface is the dark diagonal line near the top, and the cervix is to the lower left.