. The freshwater fishes of British Guiana, including a study of the ecological grouping of species and the relation of the fauna of the plateau to that of the lowlands . creeks are so full of brushthat all ordinary methods of fishing are out of the question. Trap-nets couldprobably be used effectively instead of the fence in the mouths of the creeks. Except in a very few favorable places the banks and shallows of the Demeraraare so profusely overgrown with Caladium arborescms that the seine could not beused. I engaged fishermen to collect for me some distance below Wismar and hada creek poison
. The freshwater fishes of British Guiana, including a study of the ecological grouping of species and the relation of the fauna of the plateau to that of the lowlands . creeks are so full of brushthat all ordinary methods of fishing are out of the question. Trap-nets couldprobably be used effectively instead of the fence in the mouths of the creeks. Except in a very few favorable places the banks and shallows of the Demeraraare so profusely overgrown with Caladium arborescms that the seine could not beused. I engaged fishermen to collect for me some distance below Wismar and hada creek poisoned at Kumaka, several miles above Wismar. From all of theseplaces I secured ninety species, five of which were not taken elsewhere. The speci-mens not taken elsewhere are: Ageneiosus guianensis, Poecilobrycon harrisoni, 38 MEMOIRS OF THE CARNEGIE MUSEUM Acanthophacelus bifurcus, Archicheir minutus, and Steatogenys elegans. Of theseA. minutus is known by but one specimen. The first three are new, and S. elegansis found in the Amazons. Mr. Shideler went up to the cataract at Malali butsecured only twenty-three species, of which Myloplus asterias was the only one I. Fig. 8. Fish-fence made of reeds and banana leaves on creek above Wismar. Indian with bow and arrow ready to shoot larger fishes brought up by poison. did not get elsewhere. A list of the fishes which do not extend so far inland andanother list of those which do not extend so far down stream as Wismar are givenlater. On September 29th, at 5:30 , we took the train for Rockstone. Rockstoneconsists of an hotel, terminal station of the steamer connecting with the railroad,a small store, and a number of cottages for workmen. All goods for the gold-mines,and all rubber coming from the interior are transferred here to avoid the cataractsin the Essequibo below Rockstone. The Essequibo is here divided into two chan-nels by Gluck Island. At the time of our visit rocks were exposed at the stellingand a short distance below Ro
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