Nephridial sacs in Sepia officinalis

Diagram of the nephridial sacs, and the veins which run through them, in Sepia officinalis (after Vigelius). The nephridial sacs are supposed to have their upper walls removed. v.c, Vena cava. r.d.v.c, Right descending branch of the same. r.s.v.c., Left descending branch of the same. v.b.a, Vein from the ink-bag. v.m, Mesenteric vein. v.g, Genital vein. v.a.d, Right abdominal vein. v.a.s, Left abdominal vein. v.p.d, Right pallial vein. v.p.s, Left pallial vein. c.b, Branchial heart. x, Appendage of the same. c.v, Capsule of the branchial heart. np, External aperture of the right nephridial sac. y, Reno-pericardial oriface placing the left renal sac or nephridium in communication with the viscero-pericardial sac, the course of which below the nephridial sac is indicated by dotted lines. y', The similar oriface of the right side. a.r, Glandular renal outgrowths. w.k, Viscero-pericardial sac (dotted outline).
Source: 1911 Encyclopedia Britannica, Vol. 5, p. 698

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