Help Identify

Images: 

This is in our 180 Gallon reef tank. Spotted it the other night inside some live rock. It appears to have what looks like a shrimp style body inside the split shell   2 white eyes and small legs like a shrimp  

Any help would be great

 

 

 

Is it a shell or some sort of

Is it a shell or some sort of egg case?

 

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