Puate 40 
ae 1-82. Colobocentrotus Stimpsoni A. Ag. 
1-32. Spines. 
1. Spine, from the buecal membrane close to the teeth. 
2. Spine, from the actinal system. 
-} Spine, lower side, midway between the actinal system and the ambitus. 
4.) Spine, profile of same as 3. : 
5. Spine, lower side, from the actinal side of the ambitus, from the left anterior 
ambulacrum. 
2 
Spine, upper side. 
Spine, lower side, from the actinal side near the ambitus, from the left anterior 
~~ 
ambulacrum. 
abe profile. 
9.) Spine, upper side. 
10. | Spine, lower side, at the ambitus, from the right posterior ambulacrum. These larger . 
radioles vary in length from 12 to 15 mm. 
11.) Spine, profile. 
12.) Spine, upper side. 
13. | Spine, lower side, from the abactinal side, near the ambitus, from the left anterior 
ambulacrum. : 
14.) Spine, profile. | 
15.) Spine, upper side. 
16. | Spine, lower side, from the abactinal side near the ambitus, from the left posterior 
interambulacrum. 
17.) Spine, profile. age 
18.) Spine, top view. é 
19. | Spine, lower side, midway between the ambitus and the abactinal system, from the v7 
odd anterior ambulacrum. 
20.) Spine, profile. 
21.) Spine, top view. 
22. | Spine, lower side, from the abactinal side towards the ambitus, from the left posterior 
ambulacrum. 
23.) Spine, profile. > 
24. 
25. ) Spine, lower side from the upper extremity of the left anterior ambulacrum. 
} Spine, upper side, from the upper extremity of the left anterior ambulacrum. 
) Spine, top view, from the upper extremity of the right posterior interambulacrum. 
27.) Spine, lower side from the upper extremity of the right posterior interambulacrum. 
28. Miliary spine, near the upper extremity of the right posterior interambulacrum, — 
hidden by the primary radioles. 
29. Miliary spine, lower side, from the anal system. 
30. Miliary spine, lower side, from the anal system. 
31. ) Miliary spine, upper side, from the anal system. 
32. ) Miliary spine, profile, from the anal system. 
The figures are from the same specimen, measuring 88 mm. in diameter. 
All the figures are about equally enlarged, except the shaded figures 1, 2, 5, 28, which 
are considerably enlarged, as is shown by the adjoining outlines. 
Bonin Ids., Dr. Wm. Stimpson Coll. 
