1909.] F. H. Stewart : Aquatic animals from Tibet. 123 



between the two regions. One fact may, however, be worth record- 

 ing, namely, the remarkable quantity of mud and decomposable 

 organic matter suspended in the water of the Nyang-chu. Water 

 placed in a bottle deposited a considerable layer of mud, and if 

 allowed to stand for more than a day, began to give off a most 

 objectionable odour. 



It is much regretted that no collections were made from 

 streams to the south of the Tang-la, especially in the plains of 

 Phari and Ling-matang, where the character of the surroundings is 

 still largely Tibetan. As far as I am aware no collections have 

 ever been made from the rivers of the south face of the Himalayas 

 near their sources between the watershed and the crest of the range. 

 It is, therefore, not possible to say with which of these two lines the 

 line of separation of the faunas corresponds. 



Dr. Annandale informs me that Rana pleskii, the only airiphi- 

 bian at present known from the provinces of Tsang and U , is not 

 known to occur on the south face of the Himalayas. This animal, 

 in addition to frequenting the marshes of the valleys, penetrates 

 into the most minute streams on high and bare hillsides. A water- 

 shed would, therefore, be no obstacle to it. 



LIST OF PAPERS REFERRED TO. 



1. Boulenger, G. A. . . '' On some Batrachians and Rep- 



tiles from Tibet," Aim. Mag. 

 Nat. Hist. (7), vol. xv (1905), 

 P- 378.' 



2. Burrard, S. G., and Hay- A sketch of the Geography and Geo- 



den, H. H. logy of the Himalaya Mountains 



and Tibet, Calcutta, 1907. 



. Tate Regan, C. . . '' Descriptions of five new Cypri- 



nid fishes from Lhasa, Tibet," 

 Ann. Mag. Nat. Hist. (7), vol. 

 XV (1905), p. 185- 

 4. Tate Regan, C. .. " Descriptions of two new Cypri- 



nid fishes from Tibet," Ann. 

 Mag. Nat. Hist. (7), vol. xv 

 (1905), P- 300- 



