334 I- IJIMA AND S. IKEDA. 



an organ which conld not hut he taken for the penis. In facf. further 

 dissection soon verified tlie view that we had before us a young male. 

 It is to be assumed that the hectocotyhzation had not yet commenced 

 in our specimen. 



The penis (/>.t\) is a tube-Uke body about o mm. long, arising 

 from the anterior wall of the left branchial chaml)er, about midway 

 between the anus and the gill. It is directed backwards towards the 

 inner end of the siphon. Within the visceral sac, the penis-root is 

 directly continnous with a swollen ovate body Çsp.s., figs. S & 9), 

 which looked as if consisting of a coiled tube, apparently owing to 

 the presence of spirally arranged folds Avithin. We identify this body 

 as the spermatophore-sac. This is joined at its anterior end by an- 

 other ovate body (p/'.) of about the same size, situated on the left of 

 the cœcum. This is probably the prostata. It is a thin- walled sac 

 that contained a whitish mass, which, on close exjunination, [iroved to 

 consist of certain epithelial duplicatures. From the junction between 

 the prostata and the spermatopliore-sac, a rather thick and spindle- 

 shaped duct (.s. r.), wliich proceeds towards the right, eventually to 

 continue itself into the thin vas deference. The swollen part of the 

 s[)indle-shaped duct exactly corresponds in position to the seminal 

 vesicle of other cephalopods. The vas deferens (r. d.) runs at first 

 t(jwards the left and then sharply turns on itself to pursue an opposite 

 C(jurse, thus farming a loo[) that seems to be connected with the 

 spermatophore-sac by a filamentous Ijand. The organ, wliicli is to 

 be considered as the testis Qi's.), consists of three elongated lobes or 

 rami. The first and the longest runs oljliqiiely forwards and towards 

 the left, crossing over the seminal vesicle and the prostata ; the second 

 runs forwards over the cœcum and the third, which is the shortest, 

 pursues a downvvard course behind the cœcum. The rami have a thin 

 membranous envelope, the capsule, and contain a minutely verrugated 



