540 EICHAED EVANS. 



Straits Settlements, who discovered it on Larut Hills at the 

 height of 4000 feet. In accordance with a suggestion made 

 by Mr. Pocock, I have given it the specific name Butleri in 

 honour of its discoverer. 



II. — Description op Eoperipatus Butleri. 



(a) Colour. — The dorsal surface is coloured dark brown, 

 with pale spots scattered about with a certain amount of regu- 

 larity over the Avhole of the animal's back. These spots 

 represent the large primary papillae, which contain less pig- 

 ment than the other parts of the skin, and which in almost all 

 cases have lost their apical part. The mid-dorsal position 

 is occupied by a dark chocolate-coloured line, which extends 

 from the region of the first pair of legs nearly as far back as 

 the anus. When the skin is examined with the mici'oscope a 

 narrow, non-pigraented line is seen to occupy the centre of the 

 dark line, as in the other Malay forms. The colour of the dorsal 

 surface is remarkably like that of Eoperipatus Weld on i. 

 The colour of the ventral surface is slightly paler than that of 

 the dorsal, though the difference is in no way well marked. The 

 segmentally arranged spots, which correspond to the ventral 

 organs, are very evident, owing to their yellowish white ap- 

 pearance. Eoperipatus Butleri contrasts strongly with 

 E. Weldoni as regards the colour of the ventral surface. In 

 the latter it is grey with sparsely scattered brownish spots, 

 while in the former it is not very different from the doi'sal 

 surface. It also contrasts with the greater number of my 

 specimens of the species Horsti, for it absolutely lacks the 

 pink found in that species. 



(6) Dimensions. — The specimen here described measures 

 52 mm. in length, 6 mm. in greatest breadth, and 5 mm. in 

 greatest dorso-ventral diameter. 



(c) The Characters of the Skin. — The skin is thrown 

 into folds, of which there are about fourteen to each segment 

 in the middle part of the body. The folds, when examined 

 with a hand lens, seem continuous across the back, but when 

 looked at through the mici'oscope they are seen to be divided 



