PHYSIOLOGY OF THE INVERTERRATA. 



451 



The Cephalopoda are dioecious, and the genital organs are 

 unlike those of other Mollusca. " They consist, in both sexes, 

 of lamellar or branched organs, the cellular contents of which 

 are metamorpliosed into ova and spermatozoa, and which are 

 attached to one point or line of the wall of a chamber, which 

 communicates with the pallial cavity by two symmetrically 



Fig. 79. 



Male Reproductive Organs of 

 Sepia. 



(After Dr. A. von Mojsisovics.) 

 t = testis, p = penis, vd = vas 

 deferens. pr = prostate. 



dsp = receptacle of spermatophores. 

 vs = vesicula seminalis. 



Fig. 80. 



Female Reproductive Organs 



OF Sepia. 



{After Milne-Edwards.) 



a = anus, ov = ovary. i;n = nida- 

 mental glands. gn' = accessory 

 glands. od = oviducal gland. 



od' = oviducal aperture. z — in- 

 testine. 



disposed oviducts, in the females of some species ; but in 

 most female and almost all male Cephalopods it has only one 

 duct, the termination of which is situated on the left side, 

 but may be near the middle line (male Nautihis), or even on 

 the right side (female jVautili(s)" 



In the male Sqna (Fig. 79) the genital organs consist of a 

 well-developed testis, a vas deferens, which passes into a 



