Dear Lu Peng
Marine mammal nr 7 are parts from the temporale of dolphines or similar small to medium sized toothed whale, left bone is the petrosal part and right bone is the tympanic bulla. The latter is loosely attached to the temporal and loosens easily from the skull, they are of compact build and are often called "ceto-liths" (whale stones).
Leif Jonsson
Gothenburg Museum of Natural History
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