306 THE CEPHALOPODA 
277, v.c, p.v, abv). Each afferent branchial vessel and the terminal 
portion of each abdominal vein is enclosed in the cavity of a kidney 
and is covered externally by an excretory glandular coat (Figs. 273, 
ar; 277, s.b) which forms the “spongy body” or essential part of 
kidney (see below). Except in Nautilus, each afferent vessel is 
Hie. 272. 
Ventral view of a male Sepia, obtained by cutting longitudinally the firm mantle-skirt, and 
drawing the divided halves apart. a, anus; Br, the single pair of ctenidia; c, cartilaginous 
socket in the funnel, to receive ¢’, the cartilaginous knob of the mantle-skirt,—the two con- 
stituting the ‘“‘pallial hinge apparatus”; C, the head; g, the azygos genital papilla and 
aperture ; i, the valve of the funnel; J, the funnel, which has been cut open; m, retractor 
muscle of the head and funnel; P, the fins; 7, renal papillae; &, the glandular tissue of the 
left kidney, which has been cut open ; ¢, ink-bag ; v.br, branchial efferent vessel ; v.br’, bulbous: 
enlargements (auricles) of the branchial vessels. (From Lankester, after Gegenbaur.) 
expanded at the base of the gill into a contractile glandular swelling 
known as the “branchial heart,” which is also provided with a gland- 
ular appendage, the homologue of the pericardial gland of other 
Mollusca (Fig. 277, b.h, a.p). Both branchial heart and appendage 
are contained in the coelom (Fig. 273, ¢.v) in the Decapoda, but in 
the Octopoda only the appendage of the branchial heart is sur- 
rounded by the pericardial cavity (Fig. 278, ca). In addition to the 
