ww, I suspect from the cross-section shown that this is an unusually long baculum or penile bone. The groove would have been where the urethra ran the length of the penis. The longest examples are reported to occur in walruses (up to 64 cm). The length and straightness of this one may explain why it has been preserved in this form.
Just so you guys know, I am exercising enormous restraint not making any of the dozens of puns that this thread provokes.
Yesterday, 11:20 PM
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