CEPHALOPODA. 



439 



sexes opens into the coelom close to the opening of the genital gland, and into 

 the mantle-cavity to the right side of the middle line on the oral side of the 

 anus ; while the vestigial left duct opens to the left as the so-called pyriform 

 organ. The vas deferens has an accessory gland and a spermatophore sac, and 

 opens at the end of a papilla the so-called penis. 



In Dibranchs the genital glands and genital coelom are much as in Nautilus, 

 except that the latter has no relation to the alimentary canal. The oviduct 

 possesses an oviducal gland in its course, and opens into the mantle-cavity 

 on the left side, or when two are present symmetrically on both sides. 



FIG. 353. Sper- 

 inatopliore of 

 Sepia (after M. 

 Edwards). 



Gst 



Ik 



Ov 



FIG. 354. Posterior view of visceral sac of a female Sepia 

 partly dissected (after Grobben). Ad accessory nida- 

 mental gland ; J/anus ; Gst stellate ganglion ; K gills ; 

 Kh branchial heart ; Kha pericardial gland (appendage 

 of branchial heart); Lk tube from peri visceral coelom 

 to the kidney (renal coelom), often called the aquiferous 

 canal ; N kidney ; Nd nidamental gland ; Od oviduct ; 

 Od. D oviducal gland ; Oe external opening of oviduct ; 

 Ov ovary in the genital coelom which has been opened ; 

 U ureter. 



The vas deferens opens at the same place as the oviduct, but has a much more 

 complicated structure. In Sepia we get the following parts (Fig. 352) : (1) a 

 coiled narrow tube ( Vd) which opens into the genital coelom, (2) a long dilated 

 vesicula seminalis ( Vs) with two prostatic glands opening into its terminal 

 portion (Pr), (3) a spacious sac, known as Needham's sac, in which the sperma- 

 tophores are stored, and which opens into the mantle-cavity at the apex of a 

 papilla placed on the left side. 



