Plate 18. 



1-18. Podophora atrata Agass. 

 1-18. Valves of pedicellarise. 



Tridentate pedicellaria, from the buccal membrane close to the 

 teeth, exterior view. 



Tridentate pedicellaria, from the buccal membrane close to the 

 teeth, exterior view. 



Tridentate pedicellaria, from the buccal membrane close to the 

 teeth, interior view 



Tridentate pedicellaria, from the left anterior ambulacrum, not 

 far from actinal system, exterior view. 



Tridentate pedicellaria, from the left anterior ambulacrum, in- 

 terior view. 



Tridentate pedicellaria, from the left anterior ambulacrum, in- 

 terior view profile. 



Ophicephalous pedicellaria from the right anterior ambulacrum 1, 

 midway between the actinal system and the ambitus, interior 

 >- view. 



Ophicephalous pedicellaria, same pedicellaria as 7, interior view. 



Ophicephalous pedicellaria, same pedicellaria as 7, interior view. 

 10. A valve 0.16 mm. >, Triphyllous pedicellaria, from the odd anterior ambulacrum 



among the sphajridia, exterior view. 

 * Triphyllous pedicellaria, same pedicellaria as 10, interior view. 



Triphyllous pedicellaria, same pedicellaria as 10, exterior view, 

 profile. 



Tridentate pedicellaria, from the actinal side of the left anterior 

 iuterambulacrum, near the ambitus, exterior view. 



Tridentate pedicellaria, same as 13, interior view. 



Tridentate pedicellaria, same as 13, exterior view, profile. 



Tridentate pedicellaria, from the right anterior ambulacrum, mid- 

 way between the ambitus and the abactinal system, interior 

 view. 



Globiferous pedicellaria from the odd anterior ambulacrum near 

 >■ the ocular plate, interior view. 



Globiferous pedicellaria, same as 17, exterior view, profile. 



The valves are taken from the same specimen, measuring 74 mm. in diameter, in- 

 cluding the spines. 



The measurement of the figures gives the natural size ; the enlargement of the valves of 

 each pedicellaria is the same, but the enlargement of the different pedicellarise is not 

 identical. 



Hawaiian Ids., A. Garrett Coll. 



1. A valve 0.67 mm. 



2. A valve 0.65 mm. 



3. A valve 0.63 mm. 



4. A valve 0.85 mm. 



5. A valve 0.88 mm. 



6. A valve 0.87 mm. 



7. A valve 0.57 mm. 



8. A valve 0.50 mm. 



9. A valve 0.48 mm. 



11. A valve 0.15 mm. 



12. A valve 0.16 mm. 



13. A valve 0.49 mm. 



14. A valve 0.47 mm. 



15. A valve 0.48 mm. 



16. A valve 0.39 mm. 



17. A valve 0.24 mm. 



18. A valve 0.21 mm. 



