Good evening All. I have to find the name of a few common sea urchins from Florida. If someone could put a few Latin names to
the common I'd appreciate this.  I'll give the common name and a brief description.
Sea Biscuit, ovate, fat , no holes , thick , heavy, no spines prickly brown velvet perio.
Sea mouse, tan , bristly perio, round in shape, very delicate, no spines
Common green urchin, cast is green purple, short stiff spines.
sand dollar, flat, round, 5 holes plus one near center, brown fine perio
pencil urchin, cast round , fine tan perio, heavy thick blunt spines
black spined urchin, cast white, pimpled living animal black  very long SHARP spines
From mexico, arrow head sand dollar, flat white cast, 5 holes that pertrude into edge, one large hole near center , sorry
about the common names and thank you for the help , Mark & Peta bethke