South African Species of Peripatidce. 335 



preceding pair, and not used for walking, occasionally quite obsolete. 

 Feet with two large papillae near the apex on the anterior side and 

 a single one on the posterior side. Genital opening always subter- 

 minal, longitudinal, never in the form of a transverse slit. 



In those cases in which the male has been examined, the pair of 

 legs immediately before the genital opening has been found to 

 possess an enlarged crural gland. These legs are provided with a 

 large white papilla on the ventral side in all our male specimens. 

 The terminal unpaired portion of the vas dcfere.ns is not very long. 



In the female there is no receptaculum scminis, and the oviduct 

 contains a number of embryos, all of which are equally developed 

 and of the same size.* 



The number of legs is constant in all species, with not more than 

 19 praegenital pairs. In the remaining species the number appears 

 to vary slightly. The dorsal surface is provided with a fine white 

 median line, often only partially visible in preserved specimens. The 

 outer jaw has a small accessory tooth at the base of the main tooth. 



It occasionally happens that an apical dorsal papilla occurs on a 

 foot here and there in addition to the one posterior and two anterior 

 papillae ; now and then also two posterior papillae are found on 

 some feet. 



1. No claw-bearing legs on each side of the genital opening. 



(a) Species in which the rudimentary legs on each side of the genital 

 opening arc normally without traces of rudimentary feet, and occa- 

 sionally even absent. A spinous pad is of ten present on these legs. 



1. PEKIPATOPSIS CAPENSIS (Grube). 



Peripatus capensis (ad part.), Grube, Anneliden, p. 4, pi. iv., figs. 3, 

 3-c, in : Reise der osterreichischen Fregatte 

 Novara um die Erde in den Jahren, 1857, 1858, 

 and 1859. Zoologischer Theil, Bd. ii., Abthlg. 

 iii. Wien, 1868. 



,, ,, (ad part.), Moseley and Sedgwick, in: Balfour's 



Anat. and devel. of P. capensis, Q. J. M. S. (2), 



* I found this to be the case in the female specimens of the following species, 

 which I dissected : capensis, moscleyi, balfouri, Iconina, scdgwicki, and clavigcra. 

 It must be remembered, however, that at certain times of the year a new set of 

 eggs may have entered the oviduct before the birth of the older brood ; in such 

 cases of course there would be embryos of two different stages in the oviduct at 

 the same time, but this is still a very different condition from that which obtains 

 in Opisthopatus. 



