Plate 24. 

 1-3. Dermatodiadema globulosum A. Ag. 



1. Seen from the abactinal side ; Station 3381. 



2. Somewhat smaller specimen from the abactinal side ; Station 3398. 



3. The same specimen as fig. 2, seen facing the right anterior ambulacrum. 



4-12. Dermatodiadema horridum A. Ag. 



4. Specimen with spines, seen from the abactinal side; Station 3413. 



5. The same as fig. 4, seen facing the odd anterior ambulacrum. 



6. Another specimen, partly denuded, seen from the actinal side; Station 3398. 



7. A somewhat smaller specimen than fig. G, seen from the actinal side ; Station 3413. 



8. The same as fig. 7, seen facing the right posterior ambulacrum. 



9. Tlie same as fig. 7, seen from the abactinal side. 



10. A much smaller specimen, seen from the actinal side ; Station 3407. 



11. The same as fig. 10, seen from the abactinal side. 



12. A small specimen, partly denuded, setMi from the abactinal side ; Station 3400. 



All figures natural size. 



