The Bulbaeolidia paulae is often confused with the Bulbaeolidia alba. It also seems to like protected lagoons and shallow algae-crusted reefs. However, unlike the latter it moves relatively smoothly across the algae,  rocks and sand without the telltale jerky movement associated with the “alba.”  It, too, is small but is generally more than twice the size of the alba (i.e. over an inch).  It tends to have a slightly darker colour (sometimes appearing to be red or blue,  pronounced white-tipped cerata and often lacks the orange spot on the head associated with the alba.  To 35 mm.   For more historical and taxonomic information see the Sea Slugs of Hawaii site.