350 



HANDBOOK OF INVERTEBRATE ZOOLOGY. 



This is a complicated mass of twisted and convoluted 

 tubes, which is bound together, by connective tissue, into 

 a compact body, Avhich lies on the left of the testis. Its 

 posterior end (Fig. 182, h) does not 

 join the testis, but opens into its 

 capsule, from which it receives the 

 spermatozoa after they have escaped 

 from the testis. 



In order to examine the excretory 

 duct, carefully separate the various 

 folds, by dissecting away, under 

 water, the connective tissue which 

 binds them together. It will then 

 be found to be divided into four 

 regions, the vas deferens, the vest- 

 cula seminaUs, the prostate gland^ 

 and the spermatophoric receptacle. 



Fig. 182. — Male efferent duct of Loligo 

 vulgaris. From Brock, " GescJilechtsorgane 

 der Cephalopoden." Z.Z. xxxii., 1, Taf. 1, 



Fig. 3.) 



a. Penis, b. Spermatophore sac. c. Vas 

 efferens. d. Blind sac of vas efferens. 

 e. Prostate. /. Vesicula seminales. g. Vas 

 deferens. /;. End of vas deferens which 

 opens into capsule of testis. 



1. The vas deferens (Fig. 182, ^), is a small, much con- 

 voluted tube, which opens, at its posterior end, into the 

 left side of the capsule of the testis. Its distal end 

 passes abruptly into the second region. 



2. The vesicula seminalis (Fig. 182,/), is a much larger 

 tube, which again may be divided into a proximal convo- 

 luted portion and an unfolded distal portion. 



