LOLIGO PEALII LESUEUR 247 



Organs of touch are represented by numerous nerve end- 

 ings in the integument, quite especially on the arms. 



Reproductive system. The sexes are separate and may 

 be recognized by the presence of the hectocotylized arm in the 

 matuie male and the horseshoe organ on the buccal membrane 

 of the mature female. The male reproductive organs consist of 

 a single testis, vas deferens, vesicula seminalis, prostata, ap- 

 pendix, appendicular gland, spermatophoric duct, spermato- 

 phoric sac and penis. The testis is situated in the ccelome and 

 is attached to the ccelomic wall by a mesentery. It has no duct, 

 but opens directly into the ccelome by means of a narrow slit; 

 thus the sperm is first discharged into the ccelome. Near the 

 opening of the testis is a ciliated funnel which leads from the 

 ccelome into the vas deferens. The latter opens into the vesicula 

 seminalis which has the appearance of a convoluted canal. This 

 appearance is due to its origin, but in the adult squid the vesicula 

 is a glandular sac with a very irregular lumen and presents three 

 distinct portions. A ciliated canal (Chun's canal) connects the 

 third portion of the vesicula with the genital sac which surrounds 

 the vesicula, prostata and appendix with its diverticulum and 

 opens into the mantle cavity by means of a short duct. The 

 spermatophoric duct 1 connects the vesicula with the spermato- 

 phoric sac. The latter leads into a muscular penis which opens 

 into the mantle cavity near the anus. The prostata is a large 

 gland, the duct of which opens into the spermatophoric duct 

 close to the so-called appendix with its appendicular gland. 



The spermatozoa are discharged in bundles or "ropes" from 

 the slit in the testis directly into the ccelome. They reach the 

 vesicula seminalis through the vas deferens and are here in- 

 closed in a special case or spermatophore. The spermatophores 

 are stored in the spermatophoric sac before they are transferred 



1 The term "vas efferens" used by Brooks and later by Williams for the 

 designation of this canal is unfortunate, since under this term is usually 

 understood the small duct leading from a testis to its vas deferens in lower 

 invertebrates. 



