Pate 30. 
1-16. Colobocentrotus Mertensii Brandt. 
1-16. Valves of pedicellariz. 
1. A valve 0.38 mm. ) Ophicephalous pedicellaria, interior view near the teeth. 
2. A valve 0.35 mm.) Ophicephalous pedicellaria, exterior view, near the teeth. 
3. A valve 0.81 mm. ) Tridentate pedicellaria, exterior view, close to the actinal system 
from the odd anterior ambulacrum. 
4. A valve 0.78 mm. { Tridentate pedicellaria, interior view of the same pedicellaria as 3. 
5. A valve 0.77 mm.) Tridentate pedicellaria, profile, interior view of the same as 3. 
6. A valve 0.54 mm. ) Tridentate pedicellaria, exterior view, midway between the ambitus 
and the actinal system, from the left posterior ambulacrum. 
7. A valve 0.41 mm. { Tridentate pedicellaria, interior view, from the left posterior am- 
bulacrum. 
8. A valve 0.47 mm. Tridentate pedicellaria, close to the ambitus, from the right an- 
terior ambulacrum. 
9. A valve 0.48 mm. Ophicephalous pedicellaria, exterior view, close to the ambitus, 
from the right anterior ambulacrum. 
10, A valve 0.12 mm. ) Triphyllous pedicellaria, exterior view, midway between the actinal 
system and the ambitus, from the left anterior ambulacrum. 
11. A valve 0.14 mm. J Triphyllous pedicellaria, profile, same pedicellaria as 10. 
12. A valve 0.46 mm. ) Ophicephalous pedicellaria, interior view close to the ambitus, 
from the right anterior interambulacrum. 
13. A valve 0.44 mm. { Ophicephalous pedicellaria, exterior view of same pedicellaria as 
12. 
14. A valve 0.31 mm. ) Ophicephalous pedicellaria, interior view midway between the am- 
bitus and the abactinal system, from the left posterior interam- 
bulacrum. 
15. A valve 0.27 mm. | Ophicephalous pedicellaria, exterior view of the same pedicellaria 
as 14. 
16. Avalve 0.9mm.  ‘Triphyllous pedicellaria, exterior view, close to the ocular plate, 
from the right anterior ambulacrum, 
From a specimen measuring 70 mm. in diameter, with spines. 
Bonin Ids., N. P. Ex. Ex., Dr. Wm. Stimpson Coll. 
