Mussel ovary - histology slide

Thin slice of a mussel ovary, showing numerous eggs. By measuring the sizes of
eggs and examining the stages of egg development, we can determine what time
of year the mussels reproduce.

Image courtesy Deep Explorations in Time, October 17, 2002, on Oceanexplorer.noaa.gov.
http://oceanexplorer.noaa.gov/explorations/02mexico/logs/oct17/oct17.html