Prototyphis gracilis is a species of sea snail, a marine gastropod mollusk in the family Muricidae, the murex snails or rock snails.
Houart, R. & Héros, V. (2008). Muricidae (Mollusca: Gastropoda) from Fiji and Tonga. In: Héros, V. et al. (eds), Tropical Deep-Sea Benthos 25. Mémoires du Muséum national d'Histoire naturelle. 196: 437-480.
The length of the shell attains 23.5 mm.
This marine species occurs off the Fiji Islands.