472 DUNN. 



the water dark even in daytime, and here and there branches fallen in 

 heavy snowstorms check the course of the stream and the water 

 spreads over sandy places and is barely deep enough to cover one's 

 heels. 



" It was the middle of July, 1903, and the water was warm and filled 

 with moss and weeds just washed from the mountain-side, and I 

 happened to notice an abundance of tadpoles and caught some more 

 from curiosity than with a view to studying them. 



' There were two sorts of tadpoles among them; one small and with 

 small gills was Bufo, and the other large and brown with triple gills 

 proved to be Hynobius fuscus, which I discovered later from my 

 experience. 



" I caught several of the latter, some of which I preserved and others 

 I put into water in order to feed them with algae and egg yolk. 

 About three months later these lost their gills and became land ani- 

 mals, while those in the lake reached their fullest development in 

 August and toward the end of September they lost their gills and in 

 every rain they came on land and went into the bushes. 



" Suganuma is a large lake about ten miles round located in a thick 

 wood on the way from Nikko to Joshu by way of Nonjo summit. It 

 is about 3000 feet above sea-level and the temperature there very 

 seldom goes above 16 degrees even on the hottest summer days. The 

 lake runs down to Katashinagawa, a branch of the Tone, and the other 

 end, which has been dammed with rocks and sand, may have been a 

 case of volcanic action on Mt. Shirane. 



" Like most of the lakes in this region, running along a valley, it has 

 considerable variation in its width, and is generally divided into three 

 sections with different names; Irinuma (entrance of the lake); Na- 

 hanuma (middle section); Kitamata (northern section). The last 

 extends from north to south, the other two run east and west. 



"In the middle of July, 1903, 1 came here for the first time in search of 

 specimens and found eggs of Hynobius fuscus. It was at the northeast 

 corner of Irinuma, where the Kiyomizu river enters the lake. I was 

 fishing with a net and saw something white in the water about three 

 or four feet down which looked like a sinker hanging on a fallen tree 

 near the beach, and when it was taken from the water there were 30 

 or 40 eggs surrounded by a gelatinous mass which appeared like a 

 bunch of cotton batting. The eggs were rather flat, and bicolored, 

 brown and yellowish brown. The former was animal pole and the 

 latter yolk. The gelatin like the wings of a bird formed two connected 

 bags. As I was familiar with the description of Hynobius fuscus by 



