492 IMCHAKI) KVANS. 



present in P. capensis, in which the reduction in number 

 seems to have taken place at tlie inner end of the series and 

 not in its middle, as in the Peripatimie (figs. 11a and 116; 

 figs. 12 a and 12 6). 



The Oral Papilljfi : — The oral papillae, situated at the 

 sides of the mouth, consist of two rings, which do not carry 

 skin papilla, and of a knob-like end-piece which is provided 

 with skin papiilas, chiefly on the dorsal aspect. The opening 

 of the slime-gland is slightly sub-terminal, and is surrounded 

 by four large papilla?, similar in character to those forming 

 the ring round the mouth. The oral papillae seem to be 

 extremely contractile, and are scarcely ever fully extended 

 in preserved specimens (fig. 4). 



The Legs : — The legs, which vary in number from twenty- 

 three to twenty-five pairs, are short and stumpy. There is a 

 marked difference between the arrangement of the legs in 

 the two species. In the species Weldoni they are crowded 

 towards the posterior end, the distance between the successive 

 pairs in the anterior moiety being much larger than in the 

 posterior one. In the species Horsti they are almost evenly 

 distributed along the whole length of the body, except in the 

 region of the last two or three pairs. 



The Leg-pads: — With the exception of those of the last 

 two pairs, every leg carries four pads. The last pair has 

 only two on each leg, and it often happens that they are in 

 no way well marked from each other. The penultimate pair 

 has only three, of which the proximal one is often a mere 

 vestige. Similarly the fourth pad of the antepenultimate 

 pair of legs may be fully developed. 



The Crural Grooves : — Crural grooves may occur on all 

 the legs, but on the first and last two pairs they are very 

 feebly developed, and there is often no trace of them. The 

 grooves on the second and third pairs of legs are much 

 smaller than on those further back. They extend from the 

 third row of papillae, counted from the proximal pad of the 

 leg, to a considerable distance on the ventral surface of the 

 body. 



