. The Canadian field-naturalist. January, 1921] The Canadian Field-Naturalist. 5 trally placed low mound about 60 cm. in diameter and 5 cm. high. In the centre of this mound was a broad funnel-shaped de- pression 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 witli the surface of the mud. One system was traced out by opening up all the burrows. It is represented in fi
. The Canadian field-naturalist. January, 1921] The Canadian Field-Naturalist. 5 trally placed low mound about 60 cm. in diameter and 5 cm. high. In the centre of this mound was a broad funnel-shaped de- pression 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 witli the surface of the mud. One system was traced out by opening up all the burrows. It is represented in figure 2. It will be seen that this system is not very regular, and shows a development of the burrows almost wholly 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 with running 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 then fastened around the edge of the tank, and the remaining fish was kept without 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, 17s 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 botli- ends protruding,. Fig. 3. — Wrymouth reclining in a tube in the aquarium. photograpia (). Sketched 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 tlie mound, but from one of the other openings, which sliows that they were pointing aAvay from the mound. We suppose that the mound opening is t
Size: 3243px × 771px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorottawafi, bookcentury1900, bookdecade1920, bookyear1921
