The Anatomy of OpistJiopatus cinctipes. 105 



pair of walking legs, excepting where the narrow medio-dorsal stripe 

 traverses the upper surface. The anterior surface of the head from 

 a line joining the ventral margins of the basal part of the blue-black 

 antennae to a line drawn just behind the eyes greenish black ; the 

 slime appendages creamy white, without any dark pigment. 



A live specimen measured, while extended and in the act of 

 walking, 61 mm. long by 4 mm. broad, and while contracted (but 

 not curved), only 36^ mm. by 5f mm. 



This is one of the most beautiful forms I know of, the contrast 

 between the creamy- white head and the velvety-black surface being 

 very striking. I have seen only one other white-headed speci- 

 men, viz., one of P. balfouri from Newlands (described in 1899, 

 p. 343). 



(e) Three specimens from Pietermaritzburg with 23-24 pregenital 

 legs (Purcell, 1899, p. 339). Sedgwick records a specimen with 22 

 pairs of legs from here.''' 



(/) A large $ from Eiet Vlei in the west of the Umvoti District, 

 Natal (alt. about 5,000 feet), found by Mr. Harold A. Fry. This 

 specimen has 23 pairs of pregenital legs like the last and is 

 remarkably pale in colour. 



Specimens of P. moseleyi have also been recorded from "near 

 King William's Town, Cape Colony " (Sedgwick, 1888&). 



4. Peripatopsis balfomi (Sedgw.). 



Amongst a large number of specimens from Simons Town with 

 18 pairs of claw-bearing legs, two medium-sized males with 19 pairs 

 were found. This is the first instance of such variation recorded for 

 this species. Both were captured by myself at a spot where the 

 normal form was fairly plentiful, and they resembled these in every 

 other respect. 



Further, amongst 31 specimens (12 <y , 19 ? ) which I collected 

 at a spot below Platteklip on the side of Table Mountain were 2 <? 

 with 19, and 1 2 with 16 pairs of legs, all the rest having 18 pairs. 

 The genital legs were provided with the normal pairs of claws in 

 every case. 



5. Peripatopsis leonina, Pure. 



The specimens of leonina originally described by me were all cap- 

 tured in two small valleys cutting into the south-east slopes of that 

 part of Lions Hill known as the " Saddle," i.e., the lower portion 



* Proc. Phil. Soc, Cambridge, vii., pp. 250 251. 



