[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-
Most materials are located in the University of Washington Libraries. Images were scanned by staff of the UW Fisheries-Oceanography Library.
Materials in the Freshwater and Marine Image Bank are in the public domain. No copyright permissions are needed. Acknowledgement of the Freshwater and Marine Image Bank as a source for borrowed images is requested.
The University of Washington Libraries does not provide reproductions of this image. This record contains a citation for this image. If you want to use the scanned image, acknowledgement of the Freshwater and Marine Image Bank as a source for borrowed images is requested.