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Seashells &
Fossils Ocean Treasures
The coastal waters of South Carolina are teeming with seashells. In fact,
more than 700 species live in these waters. Common local shells include whelks, angel
wings, arks, pen shells, augers, cockles, slipper shells, jingles, coquina, and olive
shells. Starfish, sea urchins, and sand dollars also can be found on Folly Beach and
Morris Island.
Searching for fossils is another popular pastime. The most common fossils
found on area beaches are sharks teeth, which are usually black or dark brown. Fossilized
sharks teeth are millions of years old. Other fossils found in the area include fish
vertebrae and fossilized shells.
The best times to look for shells and fossils are on an outgoing tide,
during a new or full moon, and after a storm.

Sand Dollar or Keyhole Urchin (Mellita
quinquiesperforata)
up to about 6 inches
The keyhole urchin, sometimes called the "keyhole sand dollar,"
is a relative of the common sand dollar (Echinarachnius parma); the five keyhole-shaped
slots are distinguishing features of the keyhole urchin.
The skeleton of this flat sea urchin is often found on the Folly Beach and
Morris Island. When the tan keyhole urchin dies, the soft tissues inside the skeleton
decompose, the spines fall off, and the skeleton is bleached white.
Keyhole urchins live on sandy bottoms in shallow water below the tide line
where they borrow into the sand for protection. In the living urchin's mouth, located in
the center of the underside (only the mouth hole remains in the skeleton), is a structure
known as "Aristotle's lantern," a set of five teeth, shaped something like the
beak of a bird, that can be used for scraping algae off rocks. The rattle you hear when
you shake the skeleton may be caused by the dried teeth inside.
A live keyhole urchin's body is covered with skin, muscle tissue, and
short, fine spines that are used for burrowing. Rows of tube feet extend through holes
forming the five "petals" on the top side.

THE LEGEND OF THE SAND DOLLAR
The Sand Dollar or Holy Ghost Shell is one of the most unusual specimens
of marine life. The markings on the shell, to some, symbolize the Birth, Crucifixion and
Resurrection of Christ. On top of the shell, an outline of the Easter Lily is clearly
seen. At the center of the Lily is a five pointed Star representing the Guiding Star of
Bethlehem that led the Wise Men. The five narrow openings are representative of the four
nail holes and the spear wound made in the body of Christ during the Crucifixion.
Reversing the shell you will recognize the outline of the Poinsettia, the Christmas
flower, and also the Bell. When broken, inside the shell are five little birds called the
Doves of Peace. Some say they are the Angels that sang to the Shepherds the First
Christmas Morning.
South Carolina Official State Shell
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Lettered Olive (Oliva
sayana)The Lettered Olive, Oliva sayana, was designated the
official shell of the State by Act No. 360, 1984. Dr. Edmund Ravenel of Charleston, South
Carolina, an early pioneer in conchology, found and named the Lettered Olive shell which
is quite prolific along the South Carolina Coast.
Shells of the family
Olividae tend to be cylindrical, smooth and shiny, and variously patterned with numerous
fine wrinkles. The lettered olive is an attractive cream or tan |
colored shell with 5 or 6
whorls and distinct suturing. The spire is fairly low; the aperture is long, smooth, and
without teeth; and, the columella shows folds. Like many gastropods, these mollusks
maintain a highly polished shell, by pulling their mantle flaps over the exposed surface.
Many specimens have purple zigzag patterns and purple outer lips. Olives are approximately
66mm in length and 20mm wide.
All members of the Olividae family are carnivorous sand-burrowers. 
Starfish Facts
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Starfish (also called Sea Stars or Sea Suns)
are related to sea urchins. They are not really fish.
- The Folly Beach starfish, known as the White Finger
Starfish, is part of the class Asteroidea and the phylum Echinodermata.
- Asteroideas are the true sea stars and sun stars.
- They vary in size from under ½ inch to 10 inches.
- They are often found alive in tide pools. Those
that wash up onto the beach are either not alive or near death. Some people think throwing
them back into the ocean will help them, but it actually does no good.
- If you find a White Finger Starfish you would like
to preserve, simply lay it outdoors in a sunny location. It will turn white and harden.
Some people like to paint them different colors.
- Starfish are not shaped like stars until they are
adults
- If a starfish looses an arm, it grows back. If a
starfish is torn in half, both halves will re-grow resulting in two starfish.
- Each sea star has hundreds of tiny feet on the
bottom of each ray. These are tube feet, or podia. These tiny feet can be filled with sea
water. The vascular system of the sea star is also filled with sea water. By moving water
from the vascular system into the tiny feet, the sea star can make a foot move by
expanding it. This is how sea stars move around. Muscles within the feet are used to
retract them.
- Each ray of a sea star has a light sensitive organ
called an eyespot. Though it can not see nearly as well as we do, sea stars can detect
light and its general direction. They have some idea of where they are going.
- One way they eat is by extending their stomachs
over their prey and digesting it externally. They hunt for food on the sandy bottom and on
reefs and on rocks.
- Sea stars eat many things. A sea star's diet can
include: barnacles, snails, sea urchins, clams, and mussels. Sea stars eat mussels and
clams in an interesting way. They surround the shell and use the suckers on their feet to
pull the two shells (or valves) apart. The sea star has enough force in its arms to
actually bend the shell! This creates an opening between the two shells that is only .01
inches wide. Using this tiny gap, the sea star puts its stomach into the clam's shell and
eats its insides. When it is done, nothing is left but an empty shell.
Other Shells
Coral
Sharks Teeth

Marbled Shark's Tooth |

White Shark's Tooth |

Black Shark's Tooth |
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Brown Sharks tooth | |
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