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[Quahog Eggs]: Fig.1.--Mature egg ready for union with male cell. Fig.2.--Spermatozoa (male cells).
1. [Quahog Eggs]:
Fig.1.--Mature egg ready for union with male cell.
Fig.2.--Spermatozoa (male cells). Note length of tail and shape of head. No attempts were made to study the minute anatomy.
Fig.3.--Egg, twenty-five minutes after fecundation, showing the two polar cells (pc) and the faintly developed yolk love.
Fig.4.--Egg just previous to the first cleavage, showing large yolk lobe.
Fig.5.--The two-celled stage at the completion of the first cleavage, fifty minutes after fecundation. The larger cell contains the yolk lobe.
Figs. 6,7,8,9.--This series illustrates the process of cleavage in the egg during the change from the two-celled to the four-celled stage.
Fig.10.--The four-celled stage, one hundred and ten munites after fecundation. Side view.
Figs. 11,12.--The eight-celled stage, one hundred and forty-five minutes after fecundation.
Fig.13.--The sixteen-celled stae, one hundred and eighty-five munites after fecundation. Side view.
Fig.14.--The thirty-
Ctenogobius stigmaticus : Egg with blastoderm in late cleavage stage
2. Ctenogobius stigmaticus : Egg with blastoderm in late cleavage stage
Kirtlandia vagrans : Egg with blastoderm in advanced cleavage stage
3. Kirtlandia vagrans : Egg with blastoderm in advanced cleavage stage
Cyprinodon variegatus : Egg with blastoderm in late cleavage stage : PB, periblast
4. Cyprinodon variegatus : Egg with blastoderm in late cleavage stage : PB, periblast
Gambusia Affinis: Ovum with later blastoderm; C, cleavage cavity
5. Gambusia Affinis: Ovum with later blastoderm; C, cleavage cavity
Bairdiella chrysura: Egg with blastoderm of many cells, late cleavage stage, surface view; pb, periblast
6. Bairdiella chrysura: Egg with blastoderm of many cells, late cleavage stage, surface view; pb, periblast
Bairdiella chrysura: Egg with blastoderm of may cells, late cleavage stage, lateral view; pb, periblast
7. Bairdiella chrysura: Egg with blastoderm of may cells, late cleavage stage, lateral view; pb, periblast
Anchovia mitchilli: Egg with blastoderm in advanced state of cleavage; pb, periblast
8. Anchovia mitchilli: Egg with blastoderm in advanced state of cleavage; pb, periblast
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