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Shark egg case or mermaids purse belonging to a Japanese Bullhead Shark, Heterodontus japonicus. Aka Japanese horn shark. Heterodontidae. Tateyama, Chiba, Honshu, Sea of Japan.

Shark egg case or mermaids purse belonging to a Japanese Bullhead Shark, Heterodontus japonicus. Aka Japanese horn shark. Heterodontidae. Tateyama, Chiba, Honshu, Sea of Japan.