. The Canadian field-naturalist. Natural history. January, 1921 The Canadian Field-Naturalist. ti-ally placed low mound about (iO cm. in diameter and 5 em. high. In the centre of tfiis mound was a broad funnel-sliaped de- [)ressi()n leading into the main entrance of the system of burrows. Scattered for some distance around the mound, within a circle with a radius of from three to five feet or even more, and opening from the burrows, were a number of holes of the same dia- meter, their margins being flush with the surface of the mud. One system was traced out by opening up all the burrows. It i
. The Canadian field-naturalist. Natural history. January, 1921 The Canadian Field-Naturalist. ti-ally placed low mound about (iO cm. in diameter and 5 em. high. In the centre of tfiis mound was a broad funnel-sliaped de- [)ressi()n leading into the main entrance of the system of burrows. Scattered for some distance around the mound, within a circle with a radius of from three to five feet or even more, and opening from the burrows, were a number of holes of the same dia- meter, their margins being flush with the surface of the mud. One system was traced out by opening up all the burrows. It is represented in figure 2. It wull be seen that this system is not very regular, and shows a development of the burrows almost Avholly on one side of the mound. Most of the branches open to the surface, but some end blindly. The openings are to be found not onlv at the ends of the the laboratory, in a flat, shallow tank pro- vided witii rniHiing salt water. They were heard making a very considerable com- motion in the late afternoon and evening, and on the next morning one was found dead on the floor. On the following morn- ing another was found dead. Boards were tlien around the edge of the tank, and the renuiining fish was kept witiiout difficulty through the season. This Individual, which was about 45 cm. in length, was a male, judging from the examination made of the others. On June 24th, a piece of black, hard rubber pipe, 1% inches outside diameter, 1% inches inside diameter, and 8 inches long, was placed in the tank. After a time the fish entered the pipe and took up a rest- ing position with both ends Fig. 3. — Wrymouth reclining in a tube in the aquarium. photograph (). Sketclied from a branches, but also at the junctions and along the course of the branches. The fish were found to emerge, not from the main opening in the mound, but frtmi one of the other openings, which shows that they were pointing away from the mound. We suppose that t
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