PLate 27. 
1-6. Dermatodiadema horridum A. Ag. 
Plates of part of abactinal system of small specimen measuring 6 mm. in diameter; 
Station 3364. 
—? 
2892 
2. Abactinal system of specimen measuring 6.8 mm. in diameter; Station 3363, 
3. Abactinal system of specimen measuring 10 mm. in diameter; Station 3362. 
Abactinal system of specimen measuring 12 mm. in diameter; Station 3400. 
4 
5. Abactinal system of specimen measuring 14 mm. in diameter; Station 3398. 
6. Abactinal system of specimen measuring 14 mm, in diameter; Station 3413. ( 
