PLATE 29. 
1-4. Dermatodiadema horridum A. Ag. } 
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The odd anterior ambulacrum of a specimen measuring 10.5 mm. in diameter with 6-7 
primary tubercles; Station 3363. 
2. The left anterior interambulacrum of the same specimen as fig. 1 (Actinal syst. Pl. 25, 
fig. 4). 
3. The odd anterior ambulacrum of a specimen measuring 20 mm. in diameter with 
7-8 primary tubercles; Station 3418. | 
4, The left anterior interambulacrum of the same specimen as fig. 3 (Abactinal syst. Pl. 
28, fig. 1; actinal syst. Pl. 26, fig. 1). [ 
\ 
5-7. Dermatodiadema globulosum A. A g. | 
5. The left posterior ambulacrum of a specimen measuring 25 mm. in diameter with 
8-9 primary tubercles; Station 3398. | 
6. The left posterior interambulacrum of the same specimen as fig. 5 (Abactinal syst. { 
Ply 20, tao) | 
7 : : * ‘ : . ¢ { 
7. The abactinal part of the right anterior ambalacrum of a specimen measuring 80 mm. 
(Abactinal syst. Pl. 28, fig. 4; actinal syst. Pl. 26, fig. 2); Station 3381. 
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