This 10mm animal appeared to be a species of Hallaxa. It was found in a Kwajalein Atoll lagoon Halimeda patch at a depth of about 9m on 12 August 2011.
These tiny animals with egg masses under a rock could be the same.
The one below was found by Christina Sylvester under a rock in about 2m of water at Emon Beach near the north tip of Kwajalein Island.
The one in the two photos below was found by Christina Sylvester on the lagoon side of Kwajalein. A close look at the first photo shows it is on an egg mass nearly hidden by the body. These photos now make me think that one of the specimens figured under Hallaxa fuscescens may be a spotted one of these instead.
Created 20 August 2011
Updated 1 February 2018