788 



ZOOLOGY 



SECT, 



a receptacle, the spermatophoral sac or Needham's sac (sp. s.), and 

 opens, nearly in the middle line at the end of a prominence the 

 penis (Fig. 680, pen.). In the female the right oviduct has a 



py r 



Fio. 684. Nautilus pompilius, male reproductive organs, ace. vesicula seminalis ; eff. rent. 

 efferent branchial vessels ; L gen. op. left genital opening ; post. ao. posterior aorta ; pyr. 

 pyriform appendage; r. yen. op. right genital opening; sp. s. spermatophore-sac ; test. 

 testis; vent, ventricle. 



I .gen,. op 



FIG. 685. Nautilus pompilius, female reproductive organs, alb. albumen-gland ; L pen. op. 

 left genital opening ; or. ovary ; pyr. pyriform appendage ; r. gen. op. right genital opening ; 

 vent, ventricle. (After Lankester and Bourne.) 



glandular dilatation, which is supposed to be an albumen gland. 

 The ova are of large size, greatly exceeding those of Sepia in 

 dimensions, containing a large proportion of food-yolk. Nidamental 



