NOTES ON THE ANATOMY OF PERIPATUS. 497 



and their position and mode of opening were described by 

 Professor Balfour (1). 



In P. nova zealandiae these accessory glandular tubes are 

 also present, but their relations are somewhat different. They 

 lie more laterally in the body. Each gland starts as a blindly- 

 ending tube near the posterior end of the body, and passes 

 forwards for a short distance. It then bends sharply on 

 itself, and passes backwards to its external opening, which 

 is situated near the posterior end of the body at its ventro- 

 lateral angle, external to the nerve-cord. This position of 

 their openings is clearly seen, both on dissection and in sec- 

 tions. Thus they open quite independently of the vas deferens, 

 therein differing from those of P. cap en sis. They also differ 

 from the accessory glands of P. Edwardsii, which Gaffron (2) 

 describes as Opening with the anus. 



Vas Deferens. 



To the naked eye the main difference between the vas 

 deferens of P. capensis and that of P. novae zealandiae ap- 

 pears to be in their relative lengths, that of the former being 

 much the shorter. This difference seems to be due to the 

 very great difference between the spermatophores formed by 

 the two species. 



The vas deferens of P. novae zeal an disc very closely re- 

 sembles that described by Gaffron in P. Edwardsii. The 

 whole of the posterior part of the duct is filled by an enor- 

 mously long spermatophore, which is surrounded by a horny 

 case. The internal cavity is enlarged in several places and in 

 these regions is filled with spermatozoa, the external case 

 being thin and composed of a single layer. In the remainder 

 of the spermatophore the lumen is very small, and the case 

 very thick and composed of several layers of horny substance. 

 The whole spermatophore has, in fact, precisely the same 

 structure as that described by Gaffron 7 in P. Edwardsii. 



The structure of the walls of the vas deferens of P. novas 

 zealandiae is also similar to that of P. Edwardsii, except 



