We saw them almost 120 or so in a 10 sq. m area such large no. of patches over a kilometer stretch, nice to see them in such a large numbers !
If you look real close, you'll see the "teats." Those are actually tube feet. There are A LOT of sea cucumbers in the shallows around Kauai. And big ones. This one was only about 15 cm or so, but the biggest cukes I saw were about half a meter.
Holothuria atra is an aquatic organism in the Holothuriidae family.