Plate 27. 

 1-6. Dermatodiadema horridum A. Ag. 



1. Plates of part of abactinal system of small specimeu measuring 6 mm. in diamet- 



Station 3364. 



2. Abactinal system of specimen measuring 6.8 mm. in diameter; Station 3363. 



3. Abactinal system of specimen measuring 10 mm. in diameter; Station 3.362. 



4. Abactinal system of specimen measuring 12 mm. in diameter; Station 3400. 



5. Abactinal sj'stem of specimeu measuring 14 mm. in diameter; Station 3398. 

 G. Abactinal system of specimen measuring 14 mm. in diameter; Station 3413. 



