Aboral surface with Madreporite1. Central disk2. Arm or ray3. Madreporite4. Spines5. Eye spot (ocellus) at tip of each ray

1 1

1 12 2 2

3

44

3

5

55

5

3

3

spine

61. Central disk2. Arm or ray3. Madreporite (stone canal to this structure underneath4. Spines5. Eye spot (ocellus) at tip of each ray6. Pedicellaria

5. Eye spot (ocellus)

6

4

1. Central disk2. Arm or ray3. Madreporite4. Spines5. Eye spot (ocellus) at tip of each ray6. Pedicellaria

4

4

Pedicellaria 3X

4

1. Central disk2. Arm or ray3. Madreporite4. Spines5. Eye spot (ocellus) at tip of each ray6. Pedicellaria

6

6

6

6. Pedicellaria40X

6. Pedicellaria100X

1. Pedicellaria 400X

1. Central disk2. Arm or ray3. Madreporite4. Spines5. Eye spot (ocellus) at tip of each ray6. Pedicellaria7. Pyloric stomach (in forceps)8. Ossicles

1

2

2

4

7 7 7

7

8

88

7. Pyloric stomach9. Stone canal

9

7 7

7 7

9

10 10

10

10

9. Stone canal10. Ring canal (connects to all five radial canals)

9

9

9

9. Stone canal 3X

9

9

9

11.Pyloric caeca11a. Pyloric duct

11 11 11 11 11 11

11a 11a 11a

11a

8. Ossicles11. Pyloric caeca11a. Pyloric duct12. Ambulacral ridge13. Gonads14. Ampulla

Partial lateral and dorsal viewPyloric caeca moved to side

11 11 11 11

1212

13

13 13

14 14 14

8 8

11. Pyloric caeca (removed)12. Ambulacral ridge13. Gonads14. Ampulla8. Ossicles

12 12 12 12 12 12 12

13 13 13 13

13 13 13

4 4 4 4 4 4

14 14 14 14 14 14 14

11

8 8 8

5. Ossicles 1x

2 2 2

2

2

1. Pyloric caeca (removed)2. Ambulacral ridge3. Gonads4. Ampulla5. Ossicles

3 3 3

3 3

4 44 4

1. Central disk15. Tube feet in ambulacral groove 15a suckers at distal end of tube foot16. Ambulacral groove17. Mouth

17

15a

15

3

3

15a

15

15

16

16

16

16

16

Oral surface with mouth

11

1

11

15a. Suckers at distal end tube feet 1X

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

3X

12. Ambulacral ridge15. Tube foot15a. Sucker at distal end of tube foot18. Radial canal19. Lateral canal

18

18

12 12

Dissecting pin in contact with radial canal just underneath of the ambulacral ridge.The lateral canals connect the tube feet to the radial canal.

Oral view of 3mm cross section of arm

15

15

15a15a

12. Ambulacral ridge15. Tube feet15a sucker at distal end of tube foot18. Radial canal19. Lateral canal20. Sucker

18

18

19

19

15

1515a

Oral view of 3mm cross section of arm showing lateral canal connecting radial canal with aSingle tube foot

12 12

15a

15a

14 14

coelom

15a 15a

11 11

12 12

16 16 16 16

11. Pyloric caeca11a. Pyloric duct12. Ambulacral ridge13. Gonads14. Ampulla15. Tube feet in ambulacral groove15a suckers at distal end of tube feet 16. Ambulacral groove

11

1515

Cross section of arm 1X

11 11 11

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