LM and TEM re-sectioning results in conventional figure plate. A, B. LM cross sections that were re-sectioned. C–F. TEM details of A. G, H. TEM details of B. Transparent yellowish rectangles with green edge show area enlarged in successive (green arrow) image with higher magnification. C. Detail of pericardial wall with ultrafiltration slits (arrow heads). D. Cross section through left kidney. E. Wall of kidney. F. Opening of renopericardial duct into kidney. G. Right kidney with most ventral end of renopericardial duct before opening into kidney. H. Most ventral end of renopericardial duct. bb, basal body; bi, basal infoldings; bm basal membrane; ci, cilia; dg, digestive gland; g, gill; i, intestine; k, kidney; me, mantle edge; mi, mitochondrium; mu, muscle tissue; mv, microvilli; nu, nucleus; os, organic shell layers; pc, pallial cavity; pe, pericardium; vg, visceral ganglion.