. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 392 WILSON GEE. shortened bodies, small eyes, a poor development of pigment, and a feeble circulation. A great assortment of defective individuals was produced in the lot of eggs treated with fifteen per cent, alcohol twenty minutes after fertilization, representing almost all of the types discussed by Stockard ('10). One of the microph- thalmic monsters so developed is figured in the text (Fig. 17).. 13 FIG. 12. An embryo six days old treated with two per cent, alcohol in sea water for fifteen minutes prior to fertilization
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 392 WILSON GEE. shortened bodies, small eyes, a poor development of pigment, and a feeble circulation. A great assortment of defective individuals was produced in the lot of eggs treated with fifteen per cent, alcohol twenty minutes after fertilization, representing almost all of the types discussed by Stockard ('10). One of the microph- thalmic monsters so developed is figured in the text (Fig. 17).. 13 FIG. 12. An embryo six days old treated with two per cent, alcohol in sea water for fifteen minutes prior to fertilization with untreated sperm. A spina bifida, anophthalmic, with scarcely any pigmentation, and with a defective circula- tion. FIG. 13. An asymmetricum monophthalmicum monster six days old from egg treated with two per cent, alcohol for fifteen minutes prior to fertilization with untreated sperm. The term defective has come to signify to the mind a monster of an extreme type. So, in the tables and in many of the refer- ences in this paper the word sub-normal has been substituted. This is necessary in order to convey accurately the idea desired; for many of the individuals of the treated lot are those of much lowered vigor without any further special defect. Many em- bryos would not reach the six-day stage, but would disintegrate, the eggs becoming cloudy before that time. In a few instances after reaching about a late blastula or gastrula stage the embryo would slowly disintegrate. Thus it is to be noted that all grades of defective individuals occurred from aberrant cleavages to marked monsters of specific types and others which were merely slow in their rate of development and small in 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 Labo
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
