36 



MEMOIRS OF THE CARNEGIE MUSEUM 



in the colony, and the fifth is a minute species imperfectly known from the few 

 specimens secured. 



Although the Georgetown trenches are a direct continuation of the canal at 

 Lama Stop-Off, we secured twenty-eight species at the latter point which we did 



Fig. 6. View on the right bank of the Demerara River. 



not get at Georgetown. Part of the twenty-eight have come from below the dam 

 at Lama Stop-Off, but even this reach of water is but recently disconnected from 

 the general system. 



From Lama Stop-Off we returned to Georgetown on the 19th of September, 

 packed and forwarded the fishes collected to the United States, and prepared to go 

 inland. Mr. Shideler left for Wismar on the 23d and I followed on the morning 

 of the 24th. The steamer left Georgetown at 8 A.M. and reached Wismar at 4:30 

 P.M. The water is muddy until Berlin is approached and becomes blackish 

 further up. Wismar is about sixty-five miles above Georgetown in a straight line. 

 The Demerara is navigable for ocean-going sailing-vessels to this point, and is 

 affected by the tide to the first cataract at Malali, about one hundred miles from 

 Georgetown, in a direct line. The entire region from Georgetown to Wismar is 

 flat, except for occasional sand-hills. Creeks enter the Demerara from both sides 

 about Wismar. At Christianburg a creek has been dammed and a canal brings the 

 water to the sawmill on the river. We collected in the Demerara river at Christian- 

 burg and at Wismar, in the Christianburg canal, and in the creeks emptying into the 



