ZOOLOGY 



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 



rcjertop 



I gen op 



P$ r 



post, aort 



FlG. C84. — Nautilus pompilius, male reproductive organs, ace. vesieula seminalis ; eff. vest. 

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

 pyriform appendage ; r, (ten. op. right genital opening ; sp. s. spermatophore-sac ; test. 

 testis ; vent, ventricle. 



Tuje-n.op 



l.gen.op 



Fig. 685. — Nautilus pompilius, female reproductive organs, alb. albumen-gland ; I. gen. op. 

 left genital opening ; op. 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 



