176 THE GENUS PERIPATUS. 



the preceding, and is without the white papilla found on 

 the last leg of the male of the South African species. Anal 

 papillae are never present. 



Internal Anatomy.— As already explained, I do not 

 propose to give in this monograph any detailed account of 

 internal structure. It will be sufficient for my purpose to sum 

 up briefly the more striking differences between the various 

 species. 



The internal structure of Peripatus novce-zealandia closely 

 resembles that of the South African species. The differences, 

 so far as I have been able to observe them, chiefly concern the 

 generative organs, and the crural glands. It has recently been 

 shown by Miss Sheldon (No. 40) that the crural glands are 

 entirely absent from this species in both sexes. 



The generative organs of the male differ from those of the 

 Cape species in three points, viz. : (1) In the much greater 

 length of the terminal unpaired portion of the vas deferens ; (2) 

 in the absence of any specially enlarged crural glands in the last 

 pair of legs ; (3) in the fact (recently shown by Miss Sheldon, 

 No. 40), that the accessory glands, which are longer than in 

 the male of Capensis, do not open with the vas deferens, but 

 on the sides of the body outside the nerve-cord and close to the 

 hind end. The terminal unpaired portion of the vas deferens 

 is continuous with the two vasa deferentia (one of which passes 

 as in Capensis beneath the two nerve-cords) at the level of 

 the last pair of legs. Thence it is continued forwards for a 

 considerable distance (as far as the level of the eighth legs in 

 some cases) ; eventually bending round to pass backwards to 

 its opening between the last pair of legs. Its walls increase in 

 thickness from before backwards, and are of a distinctly gela- 

 tinous consistency in the greater part of their course. 



The generative organs of the female differ from those of 

 Capensis in two main points, viz. : (1) The two ovarian tubes 

 are much longer, extending from the level of the eleventh to 

 that of the thirteenth, and sometimes to that of the fourteenth 

 pair of legs, and are entirely separate from one another, each 

 being suspended throughout its entire course to the pericardial 



