310 



THE CEPHALOPODA 



for the lodgment of the branchial hearts (Fig. 273, c.v). In the 

 Octopoda the anterior division no longer exists ; the genital capsule 

 is connected with the capsules of the appendages of the branchial 

 hearts by long canals (Fig. 278, a.d), and even these are suppressed 

 in Philonexis and Argonauta. 



In all Cephalopods each of the two divisions of the coelom is in 

 open communication with the exterior. In the Dibranchia this com- 



\- & 



an--' 



FIG. 276. 



View of the ventral surface of a female Nautilus, the mantle-skirt being completely reflected 

 -so as to show the inner wall of the sub-pallial chamber (compare with Sepia, Fig. 272). a, 

 muscular band passing from the funnel to the integument ; an, anus ; b, valve of the funnel ; 

 c, the mantle-skirt retroverted ; g.n, nidamental gland ; l.ov, aperture of the rudimentary left 

 oviduct ; neph.a, aperture of the left anterior kidney ; neph.p, aperture of the left posterior 

 kidney; olf, protective papilla of the left osphradium ; r.ov, aperture of the right oviduct ; 

 vise.per, left aperture of the viscero-pericardial sac ; x, post-anal papilla. (After Lankester.) 



munication is effected through the kidneys : there is a reno-peri- 

 cardial canal on either side which opens into the cavity of the kidney, 

 more or less close to its external orifice (Figs. 273, y ; 277, r.p). But 

 in Nautilus the pericardium opens directly to the exterior by means 

 of two symmetrical orifices situated close to the posterior renal 

 apertures (Fig. 276, vise.per} these must be regarded as the orifices 

 of the reno-pericardial ducts which have migrated to the surface. 

 In the Octopoda, in which the pericardial division of the coelom 



