782 



ZOOLOGY 



SECT. 



aperture with minutely lobed margin, situated on 

 tion, but by no means so prominent as in Sepia, 

 are two apertures, the oral and aboral nepliridial 

 680, a. I neph., pt. neph.), corresponding to the 

 Sepia, but not elevated on papillae. Close to 



a slight eleva- 

 On each side 

 apertures (Fig. 

 single pair of 

 each posterior 



I'. CLlit.OB 



cten, : 





^t i 



X "-&?&/ I 



l-neph 



CLTL 



p. os 



pi. neph 

 L.visc.ap 



Km. tisn. Nautilus pompilius, interior of mantle-cavity of a male specimen with the 

 pitstiTo-ventral wall reflected. . I. /"/'/' oral left nephriclial aperture; mi. anus; ctcii. 

 rtenidia ; cy. eye;./', funnel; /. ^ <i/>. left reproductive aperture indicated by a bristle passed 

 through it ; /. vise. </./. left vis'Ti-o-jicncardial aperture; n. s. Xeedham's sae ; pen. penis; 

 /-/. /"//*. aboral left nepliridial ap'Tture ; />. o.v. aboral o.sphradia ; /-. niit. o.s. right oral osphra- 

 dium ; '. ii. visceral nerves. (After Willey.) 



nepliridial aperture is an opening the viscero-pericardial (l.visc.ap., 

 r. vise, ap.) leading into the pericardial section of the coelome ; 

 these are not represented in Sepia. In both sexes there are two 

 reproductive duels, right and left; but in both the right alone 

 appears to be functional, and the left is much the smaller. The 



