Apical and basal labyrinth depth and density of membrane infoldings in the two hindgut regions. Scatter plots depict: A Median values of apical labyrinth depth versus the median values of basal labyrinth depth in cells from the anterior chamber (blue) and the papillate region (red) of three specimens B Median values of apical infoldings density against the median values of basal infoldings density in cells from the anterior chamber (blue) and the papillate region (red) of three specimens. The central line in both plots is the line of equality. Points lying on the line indicate that median value of depth/density is equal, apically and basally. Points below the line indicate that the median value of depth/density is larger apically than basally. Points above the line indicate that the median value is larger basally than apically.