82 



COMPARATIVE ANATOMY 



CHAP. 



Pig. 78.— Palllal complez and siphon of Nautilus pompilius ? (after Bourne and Lankester). 

 V, Valve of the siphon ; ro, right genital aperture ; m, the mantle fold, with the nidamental gland, 

 folded back ; an, anus ; cp, left aperture of the secondary coeloni ; Vin, left upper nephridial aper- 

 ture ; lo, aperture of the left rudimentary oviduct ; Ivn, left lower nephridial aperture. The four 

 ctenidia are not lettered. 



3C «•!• V15cfc)t^ 



Fig. 79.— Pallial complex of Nautilus pompiUus i (after Bourne and Lankester). jjc. Penis ; 

 a, muscle band of the siphon ; (s;i, aperture of the left rudimentary seminal duct ; mcpfta, iiephp, 

 lower and upper nephridial aperture of the left side ; olf, left ospluradium ; viscper, left aperture of 

 the secondary coelom ; an, anus ; j, supra-anal papilla of unknown significance ; c, mantle cut off. 



