Tubular structures in the digestive gland of <i>A</i>. <i>depilans</i> (A) and <i>B</i>. <i>striata</i> (B-D).

<p>A. Tubular structures in transverse (asterisks) and longitudinal sections (arrow) within rough endoplasmic reticulum cisternae of a basophilic cell in <i>A</i>. <i>depilans</i>; arrowhead—ribosomes, rer—rough endoplasmic reticulum cisternae without tubules. B. Large aggregation of tubules in a basophilic cell of <i>B</i>. <i>striata</i>; mi—mitochondria, px—peroxisome. C. Rough endoplasmic reticulum cisternae (arrows) are associated with the margin of these aggregates of tubules. D. At high magnification it can be seen that the tubules of <i>B</i>. <i>striata</i> possess a double wall (arrows).