240 COMPARATIVE ANATOMY chap. 



vesicula serainalis opens into the large prostata near the point wliere the latter enters 

 the sperniatophoral pouch. This point lies, not in the base, but in the neck of the 

 pouch, where the latter is produced into the long fleshy penis, the j>oint of 

 which projects into the mantle cavity. The penis is provided with a lateral 

 cjecum. 



It has already been mentioned that, as far as we know at present, only two living 



1/entruL 



i 2 3 



/ 





dorsal. 



Fio. 19S.— Female genital organs ot Sepia officinalis (cliiefly after Brock). The mantle 

 cavity is opened, tlie posterior integument of the vLsceral dome removed, the ink-bag laid some- 

 what to one side, and the oviduct uncovered. Tlie complex of organs thus exposed is seen from 

 behind. 1, Funnel ; 2, edge of the aperture of the funnel ; 3, cartilaginous locking apparatus ; 

 4, left ganglion stellare ; 5, glandular terminal portion of the oviduct witli the female genital 

 aperture ; 6, left lateral lobe of the accessory nidaniental gland ; 7, gland of the oviduct ; 8, left 

 gill ; 9, oviduct filled witli eggs which are seen tlirough its wall ; 10, left nidaniental gland ; 11, 

 mantle ; 12, ovarial sac, opened from behind, the stalked ovarial eggs are seen on its anterior wall ; 

 13, ink-bag (pigment gland) ; 14, stomach ; 15, riglit nidaniental gland ; 10, central portion of the 

 accessory nidaniental gland ; 17, right lateral lobe of the same ; 18, right gill ; 19, riglit renal 

 aperture ; 20, anus. 



Cephalopods, Nautilus and Phlloncxis carence, have paired male duets. In Nautilus, 

 the left duct is rudimentary. Whether the two ducts of Philonexis caroia; correspond 

 with the two ducts which we may assume that the Cephalopoda originally possessed 

 is very doubtful. The two vasa defereutia of Philonexis, which arise out of the 

 testicular ca})sule, and dift'er considerably in structure, unite together later, and 



