472 Records of the Indian Museum. [Vor,. VIII, 



Sedgwick. The species, as both authors have clearly shown, fall 

 into groups comparatively well defined both structurally and geo- 

 graphically and it seems convenient to recognize such groups 

 by either generic or subgeneric titles. But the arrangement of 

 these groups in separate families, as suggested by Bouvier and 

 other authors, implies adherence to a particular view of the line 

 which evolution has taken, and any such view, though it may 

 ultimatel}^ prove correct, seems at present to be based on in- 

 sufficient evidence. 



I am therefore inclined to regard the existing species of Peri- 

 patus as constituting a single family, the Peripatidae, leaving the 

 difficult problem of the descent of the various subgenera and 

 genera until further information is available. 



For the Abor species the name Typhloperipaiiis wilUamsoni 

 is suggested. The specific name is given in honour of the late 

 Mr, Noel Williamson, one time Assistant Political Officer at 

 Sadiya, who was treacherously murdered by Minyong Abors on 

 March 30th, 191 1, at Komsing, a village not many miles distant 

 from the spot where the specimens were obtained. It was owing, 

 chiefly, to the murder of Mr. Williamson and of his companion, 

 Dr. Gregorson, that the expedition of igii-12 was undertaken. 



Typhloperipatus williamsoni, Kemp. 



1913. Typlilopei'ipatiis ivilliaiiiso/n', Kemp, Rec. Ind. Mus. IX, p. 241. 



The camp at Rotung, where the majority of the specimens 

 were found was situated at an elevation of 1320 ft. on a small 

 plateau about 600 ft, above the Dihang River, one of the few 

 approximately level pieces of ground seen in the Abor country. 

 The site was at one time occupied by a village of Minyong Abors ; 

 but this was demolished in the latter half of 19 11 and the 

 villagers put up temporary dwellings half a mile further to the 

 north at a considerably greater elevation. 



The country in the vicinity of the camp was overgrown with 

 dense scrub-jungle interspersed with stones and large trees, mostly 

 jack-fruit. Here, as in so many parts, the ground had at one time 

 been cleared for cultivation and the scrub, which as a rule was 

 not more than ten feet high, probably represented some eight or 

 ten years' growth. 



It was on the eastern side of the camp on dry, gently sloping 

 ground immediatel}' above the edge of the great gorge of the 

 Dihang River that Peripatus was found. In this particular spot 

 the scrub is lower than elsewhere, exceptionally dense and inter- 

 spersed with large stones and boulders. On December 29th, 1911, 

 the first specimens, three in number, were found by my assistant, 

 Mr. R. Hodgart, and a considerable number was subsequently 

 obtained in the same locality. 



Early in January 1912, only a few days after the capture of 

 the first examples, it was decided to cut and burn the scrub in 

 the vicinity of the stockade and the services of Nagas belonging 



