Trip to Cozumel - What are these creatures called?

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stronj1

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The nudibranch was about 3/4" long. The other was maybe 4" long - are there decorator clams? These were both taken in Cozumel last week.
 
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The nudibranch was about 3/4" long. The other was maybe 4" long - are there decorator clams? These were both taken in Cozumel last week.

I think the nudi is either a white spotted or freckled sea hare.

The "clam" appears to be a frond oyster because of the valve interlock zig-zag pattern. According to Paul Humann, they tend to be well camouflaged & overgrown by a number of organisms like encrusting sponges and in this case what appears to be young coral.

 
The sea slug, or nudibranch, is an Elysia ornata or Ornate Elysia.
 
Yes, the speckles seem to match that description. The coloring is a bit different in the Humann book but I just "googled" Elysia ornata and there is a picture there that matches the coloring of the one in the picture. Thanks a bunch!
 
https://www.shearwater.com/products/perdix-ai/

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