Of about 200 species of volutes, all are carnivorous, feeding on small invertebrates. This photo shows a pronounced siphonal canal from which the long proboscis is extended, and both tentacles.
The specific area where this and the previous image were taken was called the "eel grass". During the day it was like a ghost town, but after dark all sorts of unusual fish and invertebrates emerged to stage an underwater circus, including shellfish, snake eels, cowfish, shrimpfish, octopuses, and crocodilefish, to name a few.
Identification: family Volutidae, genus/species?