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 . from beginning to decay. In the evening weseined on the rocks of the stelling and in the railroad-cut mentioned above. At thestelling we caught so many Hemidoras carinatus and allies with erected spines thatit took us a long time to untangle them from the net. Each pectoral spine of thesecatfishes is provided with retrorse hooks, the spines are erected when the fish feelshimself caught, and each spine must be individually disent
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 . from beginning to decay. In the evening weseined on the rocks of the stelling and in the railroad-cut mentioned above. At thestelling we caught so many Hemidoras carinatus and allies with erected spines thatit took us a long time to untangle them from the net. Each pectoral spine of thesecatfishes is provided with retrorse hooks, the spines are erected when the fish feelshimself caught, and each spine must be individually disentangled from the net. On the second of October we went to the Rockstone sand-bar with our twoIndians. We were soon joined by seven porters who came from Rockstone to getsand and who helped us pull the large net at the lower end of the sand-bar. Themost important captures we made consisted of specimens of Geophagus carrying youngin their mouths. The outer edge of the bar was almost barren, but yielded a fewminute, translucent specimens of Characidium, which so closely resemble our sand-burrowing darters that they amply repaid for the water-hauls. But the greatest. Fig. 12. Edge of bayou between right bank of Essequibo and outlying sand-bar at Rockstone. success was obtained in a bayou between the upper half of the bar and the we collected a large number of small fishes. The Indians took half a is a great general similarity between the contents of the net here and onedrawn at any similar locality in the Mississippi valley, although not a single species EIGENMANN: THE FRESHWATER FISHES OF BRITISH GUIANA 43 or genus occurring in the Mississippi valley was found in the catches. Here wesecured the only specimen, greatly mutilated, of the widely distributed Symbran-chus, and the young of many species of large fishes. Before starting for the sand-bank I had an opportunity of securing a lau-lau, but in the hurry of getting off,and on account of a momentary fit of p
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