52 MEMOIRS OF THE CARNEGIE MUSEUM 



houses. Unfortunately, it rained heavily, so that the Chenapowu and the Potaro 

 rose many feet and made fishing in them not profitable for some time. We went 

 up the Potaro a distance further and poisoned two creeks just below the Aruataima 

 cataract. In the cataract itself we could do nothing on account of the high water. 

 William later collected in the cataract and sent me two new genera and three new 



Fig. 20. Looking down the Canyon of the Potaro River from the brink of the Kaieteur Falls. 



species, from which it would seem that further collecting would prove profitable 

 at this point. 



The character of the fauna of the plateau is discussed in detail in another place. 

 It seemed that each creek we examined contained some one dominant form and a 

 few stragglers. The dominant forms varied in different creeks. 



I started from Holmia on October 27th, fully intending to return with Mr. 

 Linnell, but I found at Tumatumari that he had gone to England, and I did not 

 return. That I could go no further on the Potaro, could not cross over to the 

 Ireng, is a lingering regret. We reached Savannah Landing at 12:00 and walked 

 over to the Kaieteur to take a few more photographs. 



We also poisoned another creek and collected in a swamp above the landing. 

 We started down for Tukeit at 1 :30 on the 29th of October. In crossing Shrimp 

 Creek, which seemed quite impossible as a fish habitat, I caught a Rivulus with 



