Dear all,
        Just a quick question.  I collected 7 limpets of one species in Jaco
Beach, Costa Rica, a town about 50 miles southeast of Puntarenas.  They are
between 15 and 48 mm, have very strong brown ribs, and have a whitish muscle
scar on the inside surrounded by a thin ring of pale brown.  Is this a
juvenile form Patella mexicana, or is it another Acmaea limpet?