Neomonachus is a genus of earless seals, within the family Phocidae, it contains two species, the extinct Caribbean monk seal,and which extant endangered species of earless seal in the family Phocidae that is endemic to the Hawaiian Islands? 
Neomonachus:  It contains two species, the extant Hawaiian monk seal and the extinct Caribbean monk seal. Hawaiian monk seal: The Hawaiian monk seal, "Neomonachus schauinslandi" (formerly "Monachus schauinslandi"), is an endangered species of earless seal in the family Phocidae that is endemic to the Hawaiian Islands.
Hawaiian monk seal