. 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 . nal 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 Rockstone. At the bend


. 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 . nal 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 Rockstone. At the bend of the river above Rockstonethere was an extensive sand-bar exposed. We collected at the Rockstone stelling,in the railroad-cut running into the river just below the town, in a small woodlandcreek on Gluck Island, and on the sand-bank at the bend above Rockstone. The EIGENMANN: THE FRESHWATER FISHES OF BRITISH GUIANA 39 richest ground was found in the brook on Gluck Island and the slough between thesand-bank and the shore of the river. A haul made at night on the sand-bar wasalso very successful. A portion of a letter describing my first day at Rockstone follows:. Fig. 9. View on bayou back of Christianburg. Indian fishing from his corial. September 30th, 1908. Very early in the morning I engaged two Indians who were on a balata boat waiting for acrew to go up the Rupununi. They did not know English, neither did they know how to fish, andI got exasperated, till Shideler went in to show them. Hereafter I shall always dress to go into thewater myself. We worked faithfully along the stelling and below, with the poorest success I everhad anywhere. We could see fishes galore, one especially (Chalceus ?nacrolepidotus) lustrous plum-beous, with the most gorgeous, maroon colored fins, flaunted its colors in my face, but it was im-possible to get at it. At ten we came to the hotel, I completely dead beat, for this was the placewhere we were told we should catch fishes. As we were waitin


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