Ram’s horn – a mollusc with the shell on the inside

This is the internal shell of spirula spirula, a cephalopod mollusc, or the ram’s horn squid. The live squid is rarely seen as it lives in the deep ocean; we only see its internal buoyancy organ.

Ram's horn or spirula spirula, the internal shell of a cephalopod mollusc IMG_4570ce
Today was green,  grey and foamy.
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