Figure 1. Nymphopsis spinosissima. Cross section of a muscle - a single myofiber - in an appendage. The cell is suspended in the hemocoel, set off from it by a thin external lamina. Infoldings of the sarcolemma delineate a suggestion of myofibrils, a feature that is diffuse in the interior of the cell. The short dark ribbon provides a grazing view of the Z-line. 14,000x