. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. NEW PARASITE FROM THE CRAYFISH. The adult stage of B. cormtta is found at Chautauqua in the stomachs of black-bass, rock-bass and cat-fish or bull-heads, caught near the Assembly grounds, and earlier stages are found encysted in crayfish, caught near the shore just above the grounds. These localities are near the head of the lake. I have not ex- plored the lake in other places and cannot say how generally the fluke is found in it. The crayfish is clearly the host immedi- ately prior to the fish, as partly digested crayfish a
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. NEW PARASITE FROM THE CRAYFISH. The adult stage of B. cormtta is found at Chautauqua in the stomachs of black-bass, rock-bass and cat-fish or bull-heads, caught near the Assembly grounds, and earlier stages are found encysted in crayfish, caught near the shore just above the grounds. These localities are near the head of the lake. I have not ex- plored the lake in other places and cannot say how generally the fluke is found in it. The crayfish is clearly the host immedi- ately prior to the fish, as partly digested crayfish are present in the stomachs of fishes where the cysts and the young just escaped flukes are found. The infection of the crayfish is prac-. FIG. 2. Young worm still enclosed in cyst, X I2O> 'ne shaded area was opaque, and white by reflected light. tically universal. The flukes are always found encysted, never free. They are located in the parts immediately related to the reproductive system, most constantly in the muscles, especially those running from the thorax to the abdomen, also in the heart itself, and in the gonads. Remoter organs are not infected. This mode of occurrence indicates that the infection may be through the ducts of the gonads, but I have no observations to decide this point. The number of cysts per individual varies considerably, in one case 40 were found, distributed as follows : 25 in the muscles, 6 in the walls of the heart.^9 in the spermary; in another case : 16 in the muscles, none in the heart or gonad; in still another a few were seen in the muscles and none in the heart or gonads. The cysts vary somewhat in size and structure with the season. In early July they are mm. in diameter and consist of a soft fleshy grayish enveloping portion about Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly re
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
