. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. EGG-LAYING IN AMPHITRITE. 253 interesting question then arises, How are ripe eggs separated from the other ccelomic bodies in the act of oviposition? REFERENCES TO PREVIOUS PAPER. At first an attempt was made to answer this question by studying the general anatomy of Amphitrite. In this group, as shown by Meyer, the septa are incomplete or absent, with one exception. The one complete septum, called the diaphragm, is near the anterior end and divides the ccelome into two unequal cavities. Anterior to the diaphragm the nephrid
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. EGG-LAYING IN AMPHITRITE. 253 interesting question then arises, How are ripe eggs separated from the other ccelomic bodies in the act of oviposition? REFERENCES TO PREVIOUS PAPER. At first an attempt was made to answer this question by studying the general anatomy of Amphitrite. In this group, as shown by Meyer, the septa are incomplete or absent, with one exception. The one complete septum, called the diaphragm, is near the anterior end and divides the ccelome into two unequal cavities. Anterior to the diaphragm the nephridia are for ex- t o fl. FIG. i. To show the comparative size and shape of various bodies found in the coelome of Amphitrite at the time of egg-laying; a, red blood corpuscles; b, youngest free egg observed; c, young egg, with little or no yolk; d, unripe egg, nearly mature; e, mature egg. Both edge and side views shown. cretion only. The posterior nephridia are modified as gonaducts, and it is with these last that we are concerned. Their inner openings are bordered by large folded, or fimbriated, membranes, covered by strong cilia. Each opening connects with a large vascular sac, also ciliated. From these sacs tubes pass to the outer openings of the nephridia which are found in the species studied on segments 6-10 inclusive. From the dissections I came to the conclusion that there was no apparatus for sifting or "straining out" the ripe 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 resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
Size: 1535px × 1628px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
