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Aboral surface with Madreporite

Central disk Arm or ray Madreporite Spines Eye spot ( oce llus ) at tip of each ray. Aboral surface with Madreporite. 5. 1 1 1 1. 2 2 2. 5. 3. 4. 4. 5. 5. 3. spine. 3 3. 6. Central disk Arm or ray

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Aboral surface with Madreporite

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  1. Central disk • Arm or ray • Madreporite • Spines • Eye spot (ocellus) at tip of each ray Aboral surface with Madreporite 5 1 1 1 1 2 2 2 5 3 4 4 5 5 3

  2. spine 3 3 6 • Central disk • Arm or ray • Madreporite (stone canal to this structure underneath • Spines • Eye spot (ocellus) at tip of each ray • Pedicellaria

  3. 5. Eye spot (ocellus)

  4. Central disk • Arm or ray • Madreporite • Spines • Eye spot (ocellus) at tip of each ray • Pedicellaria 6 4 4 4

  5. Central disk • Arm or ray • Madreporite • Spines • Eye spot (ocellus) at tip of each ray • Pedicellaria 6 6 6 Pedicellaria 3X 4

  6. 6. Pedicellaria40X

  7. 6. Pedicellaria100X

  8. 1. Pedicellaria400X

  9. 8 8 2 2 7 7 7 7 8 1 • Central disk • Arm or ray • Madreporite • Spines • Eye spot (ocellus) at tip of each ray • Pedicellaria • Pyloric stomach (in forceps) • Ossicles 4

  10. 9 7. Pyloric stomach 9. Stone canal 7 7 7 7

  11. 9. Stone canal 10. Ring canal (connects to all five radial canals) 9 9 9 9 10 10 10 10

  12. 9 9 9 9. Stone canal 3X

  13. 11a • 11a 11a 11a 11 11 11 11 11 11 11.Pyloric caeca 11a. Pyloric duct

  14. 8. Ossicles 11. Pyloric caeca 11a. Pyloric duct 12. Ambulacral ridge 13. Gonads 14. Ampulla 11 11 11 • 13 • 13 • 13 8 8 12 12 14 14 14 Partial lateral and dorsal view Pyloric caeca moved to side

  15. 11. Pyloric caeca (removed) 12. Ambulacral ridge 13. Gonads 14. Ampulla 8. Ossicles 13 13 13 13 8 8 8 4 4 4 4 4 4 11 12 12 12 12 12 12 12 14 14 14 14 14 14 14 13 13 13

  16. 5. Ossicles 1x

  17. 2 2 2 2 4 4 4 4 • 3 3 • 3 3 Pyloric caeca (removed) Ambulacral ridge Gonads Ampulla Ossicles

  18. 1. Central disk 15. Tube feet in ambulacral groove 15a suckers at distal end of tube foot 16. Ambulacral groove 17. Mouth 16 16 3 15a 15a 1 1 1 17 1 1 15 15 16 16 3 15 16 Oral surface with mouth

  19. 15a. Suckers at distal end tube feet 1X

  20. 15a. Tube feet at distal end of tube feet 3X 3X

  21. Oral view of 3mm cross section of arm 12 12 12. Ambulacral ridge 15. Tube foot 15a. Sucker at distal end of tube foot 18. Radial canal 19. Lateral canal 18 18 15 15 15a 15a Dissecting pin in contact with radial canal just underneath of the ambulacral ridge. The lateral canals connect the tube feet to the radial canal.

  22. 12 12 19 18 18 15a 19 15 15 Oral view of 3mm cross section of arm showing lateral canal connecting radial canal with a Single tube foot 12. Ambulacral ridge 15. Tube feet 15a sucker at distal end of tube foot 18. Radial canal 19. Lateral canal 20. Sucker 15a 15a

  23. 11. Pyloric caeca 11a. Pyloric duct 12. Ambulacral ridge 13. Gonads 14. Ampulla 15. Tube feet in ambulacral groove 15a suckers at distal end of tube feet 16. Ambulacral groove Cross section of arm 1X 11 11 11 11 11 coelom 12 12 11 14 14 16 16 16 16 15 15 15a 15a

  24. Aboral surface removed showing Pyloric stomach 1X

  25. clam Ribs or spines Contents of stomach clam

  26. Contents of stomach crab clam stone

  27. crab clam stone Unknown glasslike sheet Ribs or spines Contents of stomach Plate of another echinoderm

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