486 EICHAED EVANS. 



part carrying the usual spine. The spines were not observed 

 on the four ventral prominences; they were probably rubbed 

 off. 



The opening of the renal organ of the fourth and fifth 

 pairs of legs is situated on the top of a papilla, which com- 

 pletely divides the proximal pad in two. In this feature 

 Sumatranus agrees with the species Wei doni, and not with 

 Horsti. The structure of the skin, however, has no resem- 

 blance to that of Weldoni, but is very similar to that of 

 Horsti. The papillae are arranged on the transverse ridges, 

 and are scarcely ever found in the grooves between tliem. 

 The transverse ridges rise up suddenly, and the grooves are 

 well marked. Owing to the broken condition of the skin 

 papillee it is almost impossible to distinguish in all cases 

 between primary and accessory papillee, save in so far as this 

 can be done by noticing the difference in situation and size. 

 The primary papillae consist of a truncated base, with a 

 cylindrical part on top of it, the latter carrying a spine. 

 The primary papillte occupy the whole width of the ridge on 

 which they are situated, while the accessory ones are placed 

 more or less laterally, and are less numerous than in the 

 species Horsti, to be described in the present memoir. 



IV. Description op the Two Species, 



EOPEUIPATUS WeLDONI AND EoPERIPATUS HoRSTI. 



A. Introduction. 



Of the thirteen specimens at my disposal only tAvo of them 

 — both females — belong to the species W e 1 d o n i ; the remain- 

 ing eleven belong to the species Horsti, and consist of six 

 males and five females. The former are the specimens 

 obtained on Bukit besar, the latter are those obtained at 

 Kuala Aring in Kelantan. The proportion between the 

 number of males and females of the species Horsti is rather 

 a commentary on the statement generally made, that the 

 females are more numerous than the males. In order to 



