PLATE 25. 
1-6. Dermatodiadema horridum A. Ag. \ 
1. Small specimen, measuring 7.3 mm. in diameter, seen from the actinal side; Station 
3362, \ 
2. Actinal system of a specimen measuring 10 mm. in diameter; Station 3362. 
9 
3. Enlarged view of actinal part of the odd anterior ambulacrum of the same specimen as | 
fig. 2. | 
4. Actinal system of a specimen measuring 10.5 mm. in diameter; Station 3363. | 
5. Actinal system of a specimen measuring 15 mm. in diameter; Station 3413. 
) 
6. Lower part of primary interambulacral spine of a specimen measuring 20 mm. in 
diameter; Station 3413. 
<emenn 
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