. 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 . catch a second specimen at thisplace. We found it later at Maduni Stop-Off and in other places. Cichlids werevery abundant here, and the delicious luckananee (Cichla) was more abundanthere than we found it elsewhere. It gave me particular pleasure, in honor of Aubyne, to apply the name Pristella aubynei to the species from this place,of which we collected more specimens han of any other. We seined both in the canal and
. 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 . catch a second specimen at thisplace. We found it later at Maduni Stop-Off and in other places. Cichlids werevery abundant here, and the delicious luckananee (Cichla) was more abundanthere than we found it elsewhere. It gave me particular pleasure, in honor of Aubyne, to apply the name Pristella aubynei to the species from this place,of which we collected more specimens han of any other. We seined both in the canal and below the dams at Maduni Stop-Off andLama Stop-Off. In all we secured forty-nine species, five of which were not takenelsewhere: Rhamdia holomelas, Ageneiosus brevifilis, Nannostomus simplex, Pristellaaubynei, and Hyphessobrycon minimus. The first three are certainly found elsewhere 36 MEMOIRS OF THE CARNEGIE MUSEUM in the colony, and the fifth is a minute species imperfectly known from the fewspecimens secured. Although the Georgetown trenches are a direct continuation of the canal atLama 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 damat Lama Stop-Off, but even this reach of water is but recently disconnected fromthe 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 goinland. Mr. Shideler left for Wismar on the 23d and I followed on the morningof the 24th. The steamer left Georgetown at 8 and reached Wismar at 4 The water is muddy until Berlin is approached and becomes blackishfurther up. Wismar is about sixty-five miles above Georgetown in a straight Demerara is navigable for ocean-going sailing-vessels to this point, and isaffected by the tide to the first cataract at Malali, about on
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