EOPERIPATUS BUTLERI. 541 



by a narrow, non-pigmented line similar to that found in other 

 Malay species. The folds of the skin exhibit a varying degree of 

 continuity ou the latero-dorsal aspect, for those which, corres- 

 pond to the intervals between the legs are continuous, while 

 those which are situated above the legs are discontinuous and 

 often break up, so that the papillae display a diffuse arrange- 

 ment in patches of varying shape and size. Comparison of 

 figs. 4 and 5 will probably help the reader to understand the 

 difference and appreciate the distinction which has been made 

 above. 



The conformation of the ridges and the arrangement of the 

 papilla3 on them near the mid-dorsal line resemble those found 

 in E. Weldoni, in which the folds rise up gradually, and are 

 covered with primary and accessoiy papillas. The primary 

 papiilse are few in number and extend over the greater part 

 of the width of the ridge or fold, while the accessorv ones are 

 very numerous and occupy only a portion of the width. The 

 grooves between the folds are somewhat wider in E. Butleri 

 than they are in E. Weldoni. On the sides between the 

 successive pairs of legs the folds display exceedingly different 

 characters from those which have been described above. Tn this 

 position they resemble much more closely those of E. Horsti 

 than of E. Weldoni. They rise up suddenly, and are pro- 

 vided almost exclusively with large primary papillae. The 

 accessory papillte, which are few in number in the region 

 under consideration, tend to lose their individuality in that 

 of the ridges, a feature which seems to accompany the forma- 

 tion of folds of this particular kind, for it also occurs in 

 E. Horsti. The primary papillae are provided with apical 

 portions, which are differentiated from the basal ones. In 

 E. Weldoni and E. Horsti, as a rule, the apical portion is 

 either oval or subspherical in form, and is comparatively 

 large in size, but in the species Butleri the apical part is 

 conical in shape and small in size. Even on the dorsal aspect 

 of the leg, a position in which the apical part attains its 

 greatest development in E. Weldoni and E. Horsti, it is 

 almost impossible to see it in E. Butleri. 



