Aboral surface with spines

Central diskArm or ray

Eye spot (ocellus) at tip of each ray

spines

Madreporite

Ray or arm

madreporite

spine

pedicellaria

Pedicellaria 1X

Spines on ray

Pedicellaria 3X

Spine

Pedicellaria40X

Pedicellaria100X

Pedicellaria 400X

Eye spot (ocellus)

1. Tube feet in ambulacral groove2. Mouth3. Ambulacral ossicles

2

11

1

1

1

3

3

1. Tube feet in ambulacral groove2. Mouth3. Ambulacral ossicles

1

2

3

3

Ambulacral ossicles

Tube feet

Tube feet 3X

Ambulacral ossicles 3X

Oral view of ambulacral groove

Tube feet 1X

1. Pyloric ceca2. Ambulacral ridge

12

Pyloric ceca

Pyloric ceca

Ampullae

Ambulacral ridge

Gonads

Aboral surface removed showingPyloric stomach 1X

Contents of stomach

clam

clam

Ribs or spines

clam

stone

crab

Contents of stomach

Contents of stomach

stone

clam

Plate of another echinoderm

crab

Ribs or spinesUnknown glasslike sheet

Ring Canal

Stone canal 1X

Stone canal

Ambulacral ridge

Tube foot

ampulla

coelom

sucker

Pyloric cecaAmbulacral ridge

Ambulacral groove

Ambulacral ossicles