Sven:

Thanks for the information. My best guess is that the sponge is
Neopetrosia subtriangularis. We collected it several years ago for a research
project and it was identified then as Xestospongia subtriangularis. I am just
not positive--seeing it in a different location years later. But, I have a
voucher in alcohol that I will give to someone working on sponges today. [...]