Ermm...while nymphs are in fact very minor deities, they are not considered goddesses. Also, Nereids are a type of nymph. I don't believe there is one Nereid just named Nereid. Also, Percy did not kill Crusty (or Procrustes, whatever) with the head of Medusa. He sent it to Olympus, which Annabeth calls impertinent.
Sorry for ranting like this, I just love this series!
Oh my God, I'm sorry. I haven't read Percy Jackson in a really long time, and I might have gotten confused. I'll fix the mistakes now — thanks for letting me know!
Sorry for ranting like this, I just love this series!