. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIG. 24. Cyclopic frog embryo. (Experiment R ) the frog's egg. However, for the sake of completeness a few of the more striking abnormalities of later development may be mentioned. These are: microcephalic forms with such bilateral structures as optic vesicles, ventral suckers, and nasal pits in all degrees of approximation from nearly normal to complete "fu- ; 1 These forms are seen somewhat more frequently in. FIG. 25. Spina bifida, microcephalic, ventral suckers nearly fused. Twelve hours' exposure (f
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIG. 24. Cyclopic frog embryo. (Experiment R ) the frog's egg. However, for the sake of completeness a few of the more striking abnormalities of later development may be mentioned. These are: microcephalic forms with such bilateral structures as optic vesicles, ventral suckers, and nasal pits in all degrees of approximation from nearly normal to complete "fu- ; 1 These forms are seen somewhat more frequently in. FIG. 25. Spina bifida, microcephalic, ventral suckers nearly fused. Twelve hours' exposure (from early gastrula) to M/3OO NaOH; four days in water. (Ex- periment R ) m/io LiCl than in other agents but they have been obtained in varying percentages in all of the agents used to modify develop- ment. Several of the forms are illustrated in Figs. 22-25. The history and treatment of the eggs is given in the legends to the figures. In addition to the marked apical inhibitions just mentioned the later stages show also considerable median dorsal inhibition 1 The term "fusion" is used in a purely descriptive sense for the eye of cyclopic forms, single median nasal pits, or single median ventral suckers. Whether the primordia of the organs mentioned arise as paired structures and later fuse to form a single median structure, or whether a single primordium arises that later divides into two parts in normal individuals, but which do not separate under strongly inhibiting conditions, is a question for future 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.
Size: 1948px × 1282px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
