82 



COMPARATIVE ANATOMY 



CHAP. 



CMX 



FIG. 78. Pallial complex and siphon of Nautilus pompilius ? (after Bourne and Lankester). 

 v, Valve of the siphon ; TO, right genital aperture ; m, the mantle fold, with the nidameutal gland, 

 folded back ; an, anus ; cp, left aperture of the secondary coelom ; Ihn, left upper nephriclial aper- 

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

 ctenidia are not lettered. 



FIG. 79. Pallial complex of Nautilus pompilius (after Bourne and Lankester). pe, Penis ; 

 a, muscle band of the siphon ; hp, aperture of the left rudimentary seminal duct ; nepJia, nephp, 

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

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



