78 Annals of the South African Museum. 



were smaller than those of the preceding pairs in the female, 

 although corresponding as regards the position of the external 

 openings in both sexes. 



I also examined the 12th and 14th legs respectively of two full- 

 grown females of cajJensis, but found no trace of the crural glands in 

 either. Nor were any found in a specimen of sedgwicki, of which 

 the 9th leg was sectioned. 



In some sections through the hind end of a large ? halfouri a 

 well-developed crural gland was found in the legs of the 17th pair, 

 but none in the legs of the 18th pair, no other legs being sectioned. 



Well-developed crural glands were also found in a large $ of 

 moseleyi and of leonina, but only the 9th and 10th pairs of legs in 

 the latter, and only the 17th in the former were sectioned. 



In a large ? of clavigera a leg of the 11th pair was examined, 

 and a rather small crural gland was found in the usual position. 

 Its orifice was, however, not situated upon but next to a large 

 papilla. 



Of the male sex I examined only a few posterior legs in capensis, 

 and the 10th to 18th legs inclusive in halfouri. In all these legs, 

 excepting those of the genital segment, crural glands were 

 found. 



From the above facts it is evident that these glands are by no 

 means constantly present in the females of Peripato-psis, and that 

 they may be even present in a leg in some specimens, but absent 

 from the corresponding leg in other specimens of the same species. 

 These glands are equally well developed in both males and females 

 of the same species (excepting of course those of the pregenital 

 segment), and are evidently functional to an equal degree, as a rod 

 like piece of secretion, evidently protruded and coagulated during 

 the killing of the specimen in spirits, is often seen projecting through 

 the orifice of the glands in both sexes. Prom this similarity it may 

 be inferred also that they are subject to much the same amount of 

 variation as to occurrence in the male as in the female. Whether 

 they are ever entirely absent in the latter sex has not been 

 ascertained. 



Pcripatus. — I have had no opportunity of examining the males of 

 this genus. According to Gaffron one or two crural glands were 

 present in each leg of the posterior pairs, which immediately precede 

 the genital segment in the male of the American forms examined by 

 him, but in the females these glands were absent. Each opens at 

 the apex of a large white papilla placed on the ventral surface of 

 the leg. 



