Marine biologists studying birds on the island discovered the small bottle at about noon and reported the finding to police, Richmond police Lt. Mark Gagan said last week.
Police collected the bottle, which was about 4 inches tall and 2 inches wide on either side, and brought it to the coroner's office, Gagan said.
A forensic pathologist examined the specimen and determined that it was human and that it had gestated for about 2 months. It had been kept in some kind of a preservative inside the bottle and was not decomposed, Reynolds said.
There were no markings on the bottle that could suggest where the specimen came from, Reynolds said.
The finding is no longer under investigation and the specimen will be disposed of as medical waste, Reynolds said.